I'm fairly certain the ream pad gives you your old stuff back. When loading field supplies from A2, the crate was "stenciled" with the filed number so you could use them anywhere other than A2. If you dropped them off at A3 and used A3's rearm pad, the crate you got was actually your old crate with A2 still stenciled on the side. You then could do what was mentioned above and repeatedly drop and rearm field supplies. Therefore the workaround was to turn off the rearming of field supplies so you had to get a fresh plane that was loaded with a new crate of supplies stenciled with A3. Even though it is more of a wish, it would be nice if the rearm pad would give you a new crate of supplies with the correct markings.