The history as I know it, after military service..... Was purchased by the previous owner as a cut unit. Being a Fire Chief for the City of Baytown, Texas, he had men in his department weld it back together again. Unfortunately, in their zeal to "restore" it for their chief they used a lot of bondo all over the vehicle. They did a great job on the repair/reinforcement of the body cut. I have removed some of the bondo, revealing a large number of holes in the floor and sidewall of the rear passenger compartment.
Clearly at one time the rear seat was removed for electronics. I have the book "The Sentinel and the Shooter" which is a history of the unit in Viet Nam written by a member of the unit during that time. The books says that a number of different radios & Radio Detection units were used, Buuuuutttt it also says that while many jeeps were equipped with the larger box radios, most of the time they used PRC-25's and 77's with voice scramblers.
The hole in the mount (IMHO) is too large for flag poles, and has no bottom, so a pole put in,would drop all the way down unless there was some kind of ring on the flag pole to hold it in. That being said, IT IS A POSSIBILITY because the previous owner did like to use it and his 725 for Parades.