Try to look unimportant. They may be low on ammo. The easy way is always mined. Tracers work both ways. Incoming fire has the right of way.
Teamwork is essential.
It gives them other people to shoot at. Never draw fire - it irritates everyone around you. No combat ready unit ever passed inspection. No inspection ready unit ever passed combat. Make it too tough for the enemy to get in, and you can't get out.