"Dolphin-Pac". Kinda. Mine has plastic shoulder straps that connect to the backplate. Those shoulder straps then have buckles to attach the webbing Mine has a slot for a crotch strap and even came with one threaded into the backplate
There should be a metal threader ring that will allow you to form a loop in the crotch strap. That loop goes into the waist strap; the waist strap fits through the loop.
These have a double D-ring that is used to quick release by threading the end back through the bottom D-ring. I’ll try for an illustration later. But the waist strap and the two shoulder straps (below the plastic strap) should be threaded for a quick release.
I have used that Dolphin-Pac and the shoulder straps are really slippery on a nylon/fabric wetsuit. Be aware of that, as it is a bit irritating.
PS, it will be after Memorial Day before I can get an image out for the double D-ring quick release. So let me describe it. On the shoulder, the double D-rings hang down. The bottom shoulder strap has to come up through those two D-rings, come out and be routed into the lower one. This can be cinched down to its desired length. Then, the dangling end is threaded back up through the lower D-ring, with enough of the strap out so that it can be pulled in an emergency. If it is pulled, the loop will go up into the D-rings, and release the entire strap, which comes loose through the hole behind the outside edge of the D-rings.
PS2, I found a photo of my gear which may help. Look at the right shoulder strap on the ground. It shows the routing of the lower strap through the D-rings.
This photo I took under a reef at Okinawa in 1968 shows Terry Wetzel and Stephen Samo, two USAF Pararescuemen, on a dive using the USD harness. It also shows the quick release on both Terry’s chest strap and his right shoulder strap.
Nope... That's not the Dog Bone... - This image was clipped from a 1963 US Divers Catalog that I downloaded from the VDH site.
The Dog Bone is on the left... It takes the Dog Bone nick name from it's unique shape. Interesting how it has a recess on top for correct positioning of a double hose regulator. Kind of like the VDH plate.
Last Edit: Sept 13, 2023 6:18:48 GMT -8 by surflung
Note that neather the shoulder straps nor the waist strap are connected in a quick release, which is what they were designed for. The end of the strap needs to go back up through the outside D-ring to make it a quick release.
John C. Ratliff Diving since 1959, at age 13. Haven't stopped, and still enjoy getting wet.