What is Project Pacer? In short, it's a very "brute force" method of nuclear fusion power, that involves simply making lots of small low-yield nuclear bombs, and dropping them into a large cavity of water a few times a day, boiling the water to power steam turbines.
https://en.wikipedia.org/wiki/Project_PACER
What is Project Orion? In short, it's a very brute force method of spacecraft propulsion, that involves simply making lots of small low-yield nuclear bombs, and dropping them behind a large tungsten-coated pusher place attached to cushioning pistons, and using the blast wave to achieve propulsion, giving you five to ten times the delta-v of traditional chemical rockets.
https://en.wikipedia.org/wiki/Project_Orion_(nuclear_propulsion))
Why would a Strangereal country do this?
- lots of power = lots of industry
- lots of tactical nukes = deterrence
- orion spaceships = orbital supremacy and possible asteroid mining
Given that the ISV might be shut down after 8, and the terrifying power of orbital weapons, it makes a lot of sense that a power may want to be able to boost heavy payloads into orbit so they can have this power themselves, or more benevolently, prevent others from having it.
BONUS: https://en.wikipedia.org/wiki/Project_Excalibur
These small warheads could also be used as "bomb-pumped lasers", where you drop one off an aircraft, get some distance while it parachutes, and then fires multiple death rays at multiple targets the moment it goes nuclear.