No combat-ready unit was ever passed inspection. No inspection-ready unit has ever passed combat. Teamwork is essential. It gives them other people to shoot at. If the enemy is in range, so are you.
Tracers work both ways.
The only thing more accurate than incoming enemy fire is incoming friendly fire. Radios will fail as soon as you need fire support. All weather close support doesn't work in bad weather. The bursting radius of a grenade is always one foot greater than your jumping range. The only terrain that is truely controlled is the terrain upon which you are standing.