1. Mode selection breakthrough, follow the troops, find a lot of people in the firefight area to put the medical box.
2. The medical box placed by your teammates can be shot and exploded, although it is a bit lack of morality, but business is more important.
3. There are far more people picking up ammo boxes than medical boxes, and putting a medical box next to an ammo box is super effective.
(The closer you put it, the better, everyone picks up stuff by hitting the buttons, your medkit will be picked up)
Recommended Location
Small Airfield Point C
First, use the assault to blow up the supply point in the middle, then put your medkit right above it.
Lazy strategy
1. Get a friend to bring an incendiary bomb.
2. Stand by the ammo supply station.
3. Tell him to burn himself, run out of the fire circle with 30 blood, and he'll usually be bleeding (with a few points left).
4. Get the medkit.
Repeat 4-5 times and you're done.