Good addition! That probably works the same everywhere - my unit rarely deployed anywhere, so I hadn't had much chance at witnessing something like this, but I should have remembered this from all the movies I've been watching.
Sidenote: Hollywood (etc) may not be the most accurate representation of life in the military (depending on the movie), but I'd say it's still a useful inspiration just because it's what most people are familiar with, and thus may be expecting from a roleplaying game that uses a similar theme.
current 40k RPG character: Aura Vashaan
, Astromancer Witch-Priestess
previous characters: Captain Elias (Celestial Lions Chapter -- debriefed), Comrade-Trooper Dasha Malenko
(1207th Valhallan Ice Warriors -- KIA), Sister Elana
(Order of the Sacred Rose -- assassinated), Leftenant Darion Baylesworth (Rogue Trader Artemisia -- retired), Taleera "Raven" Nephran (Hive Ganger & Inquisitorial Assassin -- mindwiped)