Thought it was called a B48 Despatchers Harness?
USL Trg with the Army at Queens Parade back in the mid 70's, I disconnected myself to go down the hole and reset the SACRU. Pilot nagging me (S/L PD), and having asked me 3 times if I was sorted (NO) he got airborne to fly a circuit leaving his Crewman to take a bow and amuse the Infantry on the HLS......