Back to the Nomad. That was a PNGDF Nomad which the lads, while attempting a STOL landing, overcooked it a bit during training. Nadzab in those years was just used for training as Lae was still open for Ops. The markings were mainly towards the rear of the A/C and on the tail fin, which unfortunately none of your pictures captured.
The closure of Lae in 1987 forced the commercial operators to Nadzab whilst the PNGDF were moved out temporarily as a plan to move the Squadron to POM was in the pipeline for early 90's, eventually moving in 1992.
PNGDF did lose a Nomad near the PNG/Indon border not far from Green River on the 4th of May 1981 with the loss of two national pilots.
The other PNGDF crash in Nadzab was in November 1987 when a formation of a Nomad, Arava and DC-3 took off for a flypast at Igam barracks for the Handover/Takeover parade to the first National CO of ATS. The DC-3 lost an engine on T/O and the crew allegedly shutdown the wrong engine and ended up in the kunai grass off R/W 09.
Needless to say, the CO's first official duty in office was to ground the crew and order an investigation...and he didn't get his flypast.