1. In ready rooms before heading out on a mission.
2. On location — like this soldier hauling the mattress he'll sleep on later.
3. Torpedo rooms on US submarines.
Junior members of submarine crews are often required to "hot rack," where another crewmember sleeps in their bunk while they are on duty.
Sailors draped towels over themselves to shield them from the lights.
7. In a field of artillery shells.
8. In the shade provided by vehicles, sometimes using each other as pillows.
9. During field training, in sleeping bags in sub-freezing temperatures.
10. Small boat operations are extremely dangerous. But when they're not launching their boats, US sailors sometimes use them to catnap.
