See ATF Form 4473 instructions for item 10 which state, “If the transferee/buyer is a member of the Armed Forces on active duty, his/her state of residence is the state in which his/her permanent duty station is located. If the service member is acquiring a firearm in a state where his/her permanent duty station is located, but resides in a different state, the transferee/buyer must list both his/her permanent duty station address and residence address.”
Example 1: PCS stationed to state A, lives on base in state A
If the transferee is a member of the Armed Forces on active duty and is acquiring a firearm in the same state as his/her permanent duty station, and he/she resides on base, the transferee will record his/her permanent duty station residence address in item 10.
Example 2: PCS stationed to state A, lives off base in state A
If the transferee is a member of the Armed Forces on active duty and is acquiring a firearm in the same state as both his/her permanent duty station and his/her residence, the transferee should record his/her residence address in item 10. The transferee’s permanent duty station address in addition to the transferee’s current residence address is not required.
Example 3: PCS stationed to state A, lives off base in state B
If the transferee is a member of the Armed Forces on active duty and is acquiring a firearm in a state where his/her permanent duty station is located, but resides in a different state, the transferee must list both his/her permanent duty station address and his/her residence address.