This "B" war film has "A" credibility for realistic drama in war.
A typical motif done well. The motif is a small unit of soldiers stuck behind enemy lines.
There is a lot going for this film. A good script is the chief reason. We get some realistic emotion in a situation of deadly danger that is no game.
Best of all, we get a "roll the dice" or "let the cards fall where they may fall" story here. There's no "contrived Hollywood predictability of bullets only finding good guys and underlings. There's no "ticket" to immortality by being the usual creep, officer, or man with a secret that means a bullet can't find you. The bullet or grenade can hit anyone at any time.
In other words, the viewer doesn't feel like the writer and director is prancing around behind the hill. It's a "natural and uncontrived" chain of events.
Which sets this apart from the usual Hollywood formula movie that owned the industry after about 1965. Cleverly done, which is probably why the bubble boys won't care for this one.