I don't expect there will be anyone of the rank of Major or above being forced to do this.
The Venue Senior Military Reps are OF-4s (Cdr, Lt Col, Wg Cdr) and the ones I know are most definately not volunteers! I know of at least one who had less than 3 days of POTL having just been for a 6 month stint in the sand-pit. There are also OF-5s and 1-stars burning the midnight oil in LONDIST and the other Front Line Comds. Yes, the majority are Other Ranks being dicked with X-Ray, Vehicle and Personnel search duties, but there are still significant numbers of "Zobs" taking one for the team as well...
LJ