Talk:SAS: Zombie Assault 4 Skills/@comment-10540150-20140918230113

Medkits will in fact give ammo from Field Supplies, as long as they weren't placed there intentionally. Say you open a room in Survivors and get two medkits. One of them was placed there intentionally as part of the room not having zombies or people in it and being designated as a loot drop, but the other spawned randomly, and will give ammo. As far as I've seen, it always works this way. Of course, you do need to actually pick up the medkit, which means you need to have taken damage.

Of course, there's the chance I misunderstood and the medkits mentioned in the tooltip are referring to the Medic's skill, which would just be silly, because that ain't loot anyway.