The important things are always simple. The simple things are always hard. The easy way is always mined. If you are short of everything except enemy, you're in combat. When you have secured an objective, don't forget to let the enemy know about it.
Incoming fire has the right of way.
No combat ready unit ever passed inspection. Things that must be together to work usually can't be shipped together. Radios will fail as soon as you need fire support desperately. Anything you do can get you shot, including doing nothing. Tracers work both ways.