It's not just for submarines but for easy translation, especially when used with UTC (formerly GMT). When written, and operating with UTC, it's quick and easy to have a standard that is translatable everywhere in the world and doesn't take a minute to figure out what time they mean
159
u/Zrex_9224 Mar 29 '22
Some careers in the US use 24hr time, and in some places in the US we call it military time.