Ex 67-21307 and from a batch of 145 purchased in 1967 at the height of the Vietnam War. Note the 'towel rack' antenna for VHF/FM direction finding, the large black blade VHF/AM comm antenna and long VHF/FM comm whip antenna just behind it on the roof. The FAC in the registration stands for Forward Air Control and duties included target marking with smoke rockets, locating downed airmen using DF equipment and talking to army personnel on the ground.