This is a TACAMO II or TACAMO III variant and one of the original 5 EC-130G models, the 151XXX series. These are the ones that established the two squadrons in 1968 and proved the mission. 151891 the last of this series was the NATC Pax River test bird that proved out all of the TACAMO mission systems improvements. Enjoyed flying them all in VQ-4 in the 1970s. 08/25/2008 @ 13:31 [ref: 22546]