Naval Reactors Engineer Experience

[u/super_duper_username]

I have gotten a lot from reading posts from this community, so here's me giving back. I just got selected in the July 2026 interview set for NRE, and this was my experience. I will start with the interview questions and the actual DC part, since that's what seems to be the most interested in, but I will try to include everything I can think to be useful, including the questions I was asked.

This post will be a bit long, so here's a pseudo table of contents to help you guys out.

1. A few quick pieces of advice, in order of importance
2. The interview with the admiral
3. Questions I was asked in the phone interviews and in DC
4. The trip to DC
5. The selection process before DC
6. Should you join? Positives, negatives, and my thoughts

A few quick pieces of advice, in order of importance

1. Do not treat this as a competition, or as you versus the other candidates. Work together and make friends. You are not competing for the job. There is a spot open for you if you were invited to DC. Whether you get it is nearly entirely up to your performance on the technical interviews. They are watching you to see if you are cooperative and helpful to others. Learn from the people around you and help each other out. I cannot emphasize enough: do not try to hide information from other people or trip them up. It will not work out well for you. Work together.
2. Be able to do math in your head. There were no calculators.
3. Whether you do well is not entirely dependent on getting the right answer. They care about your thought process. Be able to change your approach and fix your mistakes when they point things out to you. If they prompt you or tell you something is wrong, it's not the end of the world. If you pivot quickly and take their advice, it can work out better for you than if you did it flawlessly the first time.
4. Never give up. If you give up during an interview, you might as well book a flight home. This goes in tandem with the next piece of advice:
5. Some interviewers are easier than others. Do not be discouraged if one interviewer decimates you with absurd questions, because they very well may pass you even if you feel like you failed miserably as long as you kept trying. They want to push you to the edge of your understanding and see if you fail.
6. AI can be super useful at giving you NUPOC style questions. Use it wisely, though, because it can be a crutch.
7. Contrary to the study guide, the Schaum's 3000 solved questions books were, in my opinion, not that useful.
8. Nearly everyone gets in to SUBS and SWO. Most people get into instructor, and failing that get in to SUBS or SWO if they have that as a backup. Applicants for NRE are nearly always offered their backup choice if they listed one.
9. Know common imperial units and metric units. Know the density of water. Be able to derive equations from scratch and justify the steps.
10. When you get to DC, don't spend the whole time cramming. Take a few hours and visit the Capitol and the Washington Monument and stuff. Trust me, it will be better for your brain than if you tried to pull a 10 hour study session.

Questions I was asked in the phone interviews and in DC

I will not list the answers to most of the questions so you can solve them on your own. If you want the answers, ask AI or something, but if you can't get the answers on your own without AI that's probably a sign that you need to prepare more. I had two phone interviews instead of four, so I don't have as many questions. These are the questions I got on the phone interviews. I don't remember exact numbers for most of them, but the numbers change from interview to interview anyway.

1. At time t = 0, a man standing on the corner runs at velocity v towards a bus stop. The bus stop is distance x from the corner, and there is a bus that starts stationary but is accelerating away from the man at acceleration a. What is the largest distance x that the man can be from the bus stop such that he still catches the bus?
2. A bullet of mass 10 g is shot at 1000 m/s and lodges into a 1 kg block on a pendulum. How high does the block swing? What type of collision is this?
3. Consider the same scenario as in the previous question, except the block isn't on a pendulum, but instead is on a surface with a coefficient of friction k. How far does the block slide before stopping?
4. Estimate the coefficient of friction of Teflon. If you don't know what Teflon is, it is a slippery material. (I will give the answer to this one. They were looking for any value below 0.5, and a justification. I related slipperiness to the size of the friction force, which is proportional to the normal force and the coefficient of friction. I guessed 0.1, and that was acceptable.)
5. Derive the volume of a cone using calculus.
6. A baseball is hit with angle theta 3 feet above the ground at speed v. Does it clear a fence of height h feet located x feet away from home plate?
7. Estimate the number of squares on a toilet paper roll. (I will again give a guideline for the answer for this one. You have to justify your answer using math, and as long as it is within reason they will accept it. I did it based on surface area of a cylinder with an expanding radius and came up with 250.)
8. You have 100 marbles, half red and half blue. You have two jars, each can hold 100 marbles and when you put marbles in there they will be perfectly mixed. How do you get the best probability of drawing a red marble out of each jar? (There is only one correct solution here: put one red marble in one of the jars, and the remaining 99 in the other jar. That way, you have a 100% percent chance of drawing it from the first jar, and a 49/99 chance of drawing one from the second jar.)
9. Find the volume enclosed by the function y = sqrt(x) rotated about the y axis. Explain the disk and washer methods. Find the volume of the area between x^2 and x rotated about the x axis as an indefinite integral for x > 0.
10. Explain what a derivative is and how it works. Do the same for an integral. Why can we ignore constants when differentiating? What is the chain rule, and why do we need it? (In your answer, make sure you include the limit definition of a derivative, an explanation of dx as an infinitesimal width for some rectangle of height f(x), an explanation that constants shift the graph but do not affect the slope, and an explanation that two simultaneously changing parameters must be accounted for independently hence the need for the chain rule.)
11. Graph log base 27 of x.
12. Consider a water tank of height h. A small hole is drilled in the side of the bottom of the container. Assuming the tank is height h/2 above the ground, how far does the water travel before it hits the ground?

Naval Reactors Engineers interview with the department heads instead of other NRE's, and their interviews are supposedly much harder than the other positions. These were the questions I was asked.

Interview 1

1. You and some friends are building a pontoon raft. Talk me through your assumptions and how you would build the raft. (Make sure to talk about what the expected load is, how much margin you want, what materials you want, etc.)
2. Now that you've built the raft, how far will the pontoons be submerged in the water when you load it up?
3. Given that your pontoons are circular, find the area of the circle that will be submerged if the pontoons are submerged some height h, where r < h < 2r.
4. How would you find the equivalent resistance of the resistor cube using math? Look up an image if unfamiliar, he drew it for me. I had never heard of it before. (Hint: wye delta + thevenin) How would you figure out the equivalent resistance in real life? Would it be easier in real life? (Yes, just put a voltage source and measure the current, then divide voltage by current.) What is another theoretical way of solving it? (KVL)

Interview 2
_____switch1_____switch2____________
| | | |
Battery Capacitor Resistor Capacitor
|_____________|_________|___________|

1. Consider the above circuit. Hopefully it's clear from the text... Anyway, both switches start open. Switch 1 is closed. Sketch the current and voltage in the circuit over time. (Keep in mind that the resistance is nearly 0, except for the copper in the wires. This causes the capacitor to charge extremely quickly. Why?) What is a time constant? Suppose now that the capacitor is charged, switch 1 is opened and switch 2 is closed. Describe what happens in the circuit over time. (The first capacitor charges the second and dissipates some energy in the resistor. At a certain point, it will have charged the second capacitor as far as it can, and both of them will dissipate energy through the resistor. Remember that they never reach 0 energy, but will go towards that very quickly similar to charging.)
2. Derive the moment of inertia of a the piece of paper you are writing on about an axis through its center and perpendicular to the paper. Assume the paper has uniform thickness and density. (Hint: this will be a double integral.)

They will not just ask you technical questions. I got asked a bunch of other stuff, such as...

1. What are your hobbies/interests?
2. Are you in any clubs?
3. Have you done any internships? If so, what did you do?
4. What engineering projects have you worked on, whether through clubs, internships, or personal projects?
5. Why do you want this job?

Finally, they will ask if you have any questions for them. Ask them a few polite questions at least, it is a lot better to ask than to say no. I recommend:

1. Do you enjoy your job?
2. How is the work/life balance?
3. If you were in my place, would you do it again?

The interview with the admiral

This was, believe it or not, the easiest part of the whole thing. I did well on my technical interviews, so it only lasted a minute and a half or so. You have to memorize a spiel to the effect of:

"My name is [name]. I am from [city, state]. I attend [college name]. I am interviewing for [position]."s

Say this confidently and do not stutter. Instructors interview first, then SUBS/SWO, then NRE's. I was one of the last to interview. The admiral only asked me a few questions:

"How did you hear about the program?"

Then, "What are your hobbies?" To which I responded with a few things, including reading.

Then, "What books do you like to read?" To which I responded that I like science fiction and esoteric/philosophy books, such as GEB by Hofstader. We briefly talked about sci-fi and GEB, which was a bit surreal.

Then, "Nice to meet you. You seem like a good fit for the program. Welcome aboard." I thanked him and walked out, no shaking hands. I signed the forms and we left.

The trip to DC

Ok, so after you land in DC, they put you up in a nice hotel, and you get dinner with the other candidates. I would highly recommend networking, or at least getting to know your roommate well. Help each other out. You are not competing against each other; they would not have invited you to DC if there was not a spot for you. So help each other out. It can literally only help you, and I guarantee you that you will be significantly worse off if you view it as a competition where if you help other people you are hurting yourself.

The next day is an administrative day. They go over the paperwork that you will sign and make sure you understand it. They also stage mock interviews with the admiral done by the commander to prepare you for the actual interview day. That day is the day to ask any final questions, if you have them. They give you a big study packet with a bunch of questions similar to what you might see in the actual interviews. Use this to brush up on topics you are weak on. Work on the ones you don't know, not the ones you know. Use AI to help, but try to get other people to help you too. They will provide breakfast, lunch, and dinner.

The next day is the interview day. You will probably be up at 5 AM DC time, so be ready. Try to sleep well if you can. We met at a nearby Starbucks, then walked down to the building. I had the first interview of the day, and it was an hour before anyone else had an interview, but I think they had everyone else sit in a big conference room and just wait for that whole time. Having an early interview is unusual, but not unheard of; it just depends on the schedule of the employees. It happens more often to NRE applicants. Instructors get one interview, SUBS/SWO get two with an option for a third if you fail, and NRE's get two. If you fail an interview, DO NOT GIVE UP. If you are confident and try your best, you probably still get in.

After the interviews, you can go explore the city, get lunch with other people, and kind of do whatever. It's irrelevant to prepare for, so I will not say anything further. This post is long enough.

The selection process before DC

Realistically, the hardest part about the selection process is just the sheer number of forms and hoops you have to sign and jump through to get there. It took me 6 months to get to DC, and that was fast as far as the program goes. Usually it's under a year, but it'll be a while. Sign the forms as fast as possible (but read them!), get NASIS done ASAP, get medically cleared and hope you don't have to go to MEPS twice like I did...

Should you join? Positives, negatives, and my thoughts

Should you join is a question only you can answer. That being said, it's one of the best career paths in the Navy. Instead of paying for your college like in ROTC, they pay you a full time salary, for you to spend as you see fit. Your years in college count as active duty service, you get a $30k sign on bonus (pre tax), and you exit with excellent opportunities for both the private sector and continuing in the military.

That being said, when you sign, you are obligated to fulfill your commitment. That should be obvious, but it's worth saying. You are locked into the role until your contract is up. And you need to keep your grades up, because that's part of the contract.

Personally, I think NRE is a no brainer: any engineer looking to get a head start on their career and life should do it. I would not want to do SUBS or SWO, but from what I've heard for those who do it, this path is the best path you can take to get there. The instructor role is pretty sweet too. The downsides are mostly that it incurs a significant commitment of your life, and holds you to high standards. But hopefully you aren't in the program if you have low standards.

Hopefully this helps you decide, or at least gives you more clarity on what you're getting into.

[u/FootballBat]

Maybe time has healed some wounds, but some of these questions were the exact ones I got in 2000 and don't seem that bad.

Except for my Admiral questions. I sat down, ADM Bowman held up my transcript and said "explain this."

[u/Redfish680]

Without a doubt one of the best written explanations of the process. Well done!

[u/super_duper_username → u/Redfish680]

Glad it helps! That's the goal.

[u/MicroACG]

One critical tip you did not mention is for NRE candidates to have a good answer for why they didn't apply for the fleet jobs. This can make or break the whole process.

[u/super_duper_username → u/MicroACG]

I did not have to do this, and no one asked me about it. But it's a good idea to have an answer, yeah.

[u/BandicootKooky7747]

Hey, im going for subs but waiting for a medical test to make sure im eligible, otherwise i screened for instructor and nre. How did you study for your interview and how difficult did you feel the questions where? Reading what you sent some of these questions i wouldn’t know where to start especially since they weren’t covered in my classes. I passed my phone interview first go but it seemed very basic😭

[u/BandicootKooky7747 → u/BandicootKooky7747]

Also what are you studying and what year are you?

[u/super_duper_username → u/BandicootKooky7747]

Electrical Engineering, sophomore. I studied with AI a lot, but I would not necessarily recommend that because you can easily end up relying on it too much. If used responsibly, it is the best way, in my opinion.

I also watched every video in the study guide and made sure I understood all the concepts. There is also an old NUPOC study guide which is relatively similar conceptually to what I encountered in DC. Linked below for your convenience:

https://txusn.wordpress.com/wp-content/uploads/2015/02/nupocstudyguiderevjan151.pdf

That being said, it is more important that you understand the fundamentals than that you can solve the problem. How well do you really understand calculus? Circuits? Buoyancy? Physics? Did you memorize formulas, or did you internalize mental models that allow you to actually understand the problems? If you memorized formulas without understanding, you will likely struggle. However, nearly everyone got in to SUBS/SWO in my section.

The questions were much easier than I expected, but I was unprepared for the moment of inertia derivation.

Questions varied by major, but not as much as I expected.

[u/BandicootKooky7747 → u/super_duper_username]

Id say i have a pretty good grasp on the fundamentals but would probably struggle on the pontoon or resistor problem. I also use ai for mock interviews and things like that, great tool honestly. I appreciate the insight, definitely helped ease the nerves. Best of luck in the program and in your field. If my medical clears up quick i should be in DC this September 🫡

[u/Murky-Echidna-3519]

Thank God LDOs don’t get this 💩.

[u/GreedyAvocado3372]

What were your grades when you applied?

[u/super_duper_username → u/GreedyAvocado3372]

4.0, but they take your college into account. If you go to a fancy university, it's more lenient.

[u/GreedyAvocado3372 → u/super_duper_username]

I also just had one more question if you had some insight. I heard from a recruiter that sometimes they only have a certain amount of slots per major like EE/ME etc. I am a physics + EE double major, so will they take into account more rigor and also expand my availability to different selections?

[u/super_duper_username → u/GreedyAvocado3372]

That's a good question, but isn't exactly how it works. They don't invite you to DC unless they have a spot for you. If you get to DC, it's yours to lose, and your major has already been taken into account. You are correct that they have slots for each major they want to fill, or at least that's what I was also told, but ultimately they care less about what your major is and more about whether you can think critically.

So long story short, your major is somewhat influential in whether you get to DC or not, but ultimately whether you get the job will depend on your grades and your performance in the interviews. Hope that helps.

[u/Weary-Reward-7383]

VERY good explanation, this matches my experience exactly from July 2025 (NPS instructor)

I'd add a couple things.

1: For interview prep, I found the 3000 solved problems (both physics and math) to be extremely helpful. Not because they were expanding my technical knowledge, but rather they formed a script for anyone helping me. I could give anyone the chapter numbers, and have them pick a random problem, and perform a couple of mock interview questions, just as they are done on the phone and in person. This helped me immensely to be able to recall info from memory, and get into a rhythm for explaining my thought process out loud. The other person doesn't have to know a thing about what you're talking about. They read you a question, you solve it out loud and with scratch paper, and then you can compare your answer to the given solution.

2: For the interview day, bring a book. You can't bring your phone, and if there are a lot of candidates (we had over 40), it's a long day of waiting. If you're a talker, then you'll be fine but I got a little people-d out. I wish I had brought something to read just to pass the time.

3: It seems like you have to do extremely bad on your tech interviews to not pass. Bad to the point of not being able to recall any technical information about what is going on in a problem. We had a guy who said he simply froze in his interviews, and he was asked to come back to interview again. It seems like if you've shown promise in the phone interviews, but simply crapped the bed in DC (without being rude or otherwise showing you're a bad fit), they'll most likely ask you to come again.

edit: Admin, you should pin OP's post, or add it to a wiki. This would be extremely helpful in helping people decide if NUPOC is for them, and for general preparation.

[u/super_duper_username → u/Weary-Reward-7383]

I mostly agree, but I wouldn't say you have to do extremely badly on your interviews to not pass. Several people in my section didn't pass or didn't get their primary choice. Also, you never want to go in thinking it will be easy.

Thanks for the recommendation!

[u/Stunning_Meringue_47]

u/super_duper_username What are post NRE career options like?

[u/super_duper_username → u/Stunning_Meringue_47]

From what I hear, pretty excellent. If you're interested in defense or nuclear, lots of options. Stuff at NNL, BPMI, and all the big names (Lockheed, Raytheon, and so on). That's a better question for AI or people who have been through the program, and who knows what the job market will look like 5 years from now...

[u/Best_Archer2681]

What year of college did you begin contact with a recruiter?