Apache was delivered to the U.S. Navy in 1981 .
USNS Apache ( T - ATF - 172 ) , fifth United States Navy ship of the name , is the last of the Powhatan class of fleet ocean tugs .
USNS Apache ( T - ATF - 172 was delivered to the United States Navy   in 1981 .
USNS Apache ( T - ATF - 172 ) , fifth United States Navy ship of the name , is the last of the Powhatan class of fleet ocean tugs .