Last night I watched Black Hawk Down once again, and for the first time consciously thought about this particular scene featuring a Delta operative and a Ranger.
Now I know it is a movie, still, it draws inspiration from real events (1993 Battle of Mogadishu) and institutions. My question focuses more on the real life aspect than what was meant by it in the movie. Therefore I am asking my question here, and not on Movies SE.
In the scene, the soldiers are having a barbecue at the base, and one Delta operative is caught at the buffet with a "hot weapon" (firearm with safety off, and presumably live ammunition). Confronted about this by a Ranger, he flatly responds by saying that his finger is his safety.
During my conscription service ALWAYS having safety on (in addition to not having a round chambered, not pointing the gun at people and resting the stretched trigger finger on the trigger guard) when handling live ammunition was the prime instruction. Then again, I have never been to a war zone, things might be different there.
Nevertheless, running around with a "hot weapon" in such close quarters full of friendly soldiers seems super reckless and irresponsible to me. More so when bearing in mind that assault rifles may chamber or even fire rounds by itself, by falling to the floor for example.
What is the policy on using the safety lock on firearms in the US Armed Forces?