I'm going to take a flier on this one.
The aircraft shown in detail is a Sikorsky S58C reg OO-SHG "loaned" by Sabena Airlines to the Belgian military for service in Katanga province in the Belgian Congo, later called Zaire etc etc.
They were on loan from 1960 to 1962 and these pictures would be the repatriation to Europe. Check your charts and you'll see Beira is a safe way to get out of the Southern Congo, just follow the Zambesi to the sea
