This tip works best if you're good at visualising things. If you aren't, work on it. If you don't know how, PM me and I'll share the exercises I used.
Visualise the scene you're trying to portray, as though it were a clip from a film. Pick your favourite sort of film - the usual is third person, but you get to include thoughts and feelings without needing a smug voice-over talking about how he or she won the war single-handed.
Start your viewpoint in with the trainees - include what they're hearing (i.e. the soft hum of the life support system, the hiss of a passing cleaning robot) and what they smell (such as the crisp, clean and entirely artificial scent of a new spacecar). Look at them, all young and innocent and freshly-pressed (are those nice new uniforms perfectly comfortable?). Become one of them, nervous and hopeful and trying so very hard not to dance with anticipation - and then turn and look out of the window/at the viewscreen. See what they're seeing, see it for the first time with them, and write it down.
This is the book of the film. Your film. And your film is a 5-D performance. It comes in smell-o-vision, it comes in taste-o-matic, and it comes in a full-feedback VR suit.
I pity Hollywood. They only get two senses to play with.