You can win without fighting, but it's a lot tougher to do. And the enemy may not cooperate. It's easier to expend material in combat than to fill out the forms for Graves Registration. Weapons Always keep in mind that your weapon was made by the lowest bidder. The law of the bayonet says the man with the bullet wins.
Tracers work both ways.
The best tank killer is another tank. Armored vehicles are bullet magnets, a moving foxhole that attracts attention. All five second grenades are three seconds. The bursting radius of a grenade is always one foot greater than your jumping range. Recoilless rifles, aren't.