The informal account I heard about the "People Pod" had it that Sikorsky did not challenge the Army's desire to utilize "explosive bolts" for attaching the Pods....actually releasing the Pods in an Emergency.
The rumor was that the Army design criteria employed the explosive bolts but did not provide for an adequate safety system for the "People Pod" as it used a generic safety system for all the Pods....which of course included a Cargo Pod, a Hospital Pod, and the "People Pod".
The Crane Pilots decided to refuse to fly any aircraft that had a People Pod when the Army insisted (in a manner common to many Armies.....to find a field expedient method that was at the same time quick and cheap to implement) upon attaching some Sixty Thousand Locking Wire to the Pod and running it through the Rear Facing Cockpit and up the stairway into the Forward facing Cockpit Left Pilot's Seat where the Aircraft Commander sat.....and fastening that end around the AC's Wedding Tackle....so if the Pod was jettisoned it would be intentional and out of dire need and not due to some finger fumbling around with the wrong switch in the Cockpit.
Perhaps Brother Dixson can research that rumor for us.