John,
As Peter will bear out, we tried everything in Malaya predominantly to see how long it lasted.
I can say hand on heart, it looked great in its box, but once it saw the jungle and the humidity and constant rain NOTHING HMG gave us worked for long.

Even the issue "Jungle webbing" that literally slid off you when it was wet. Made of plastic with anti slip buckles....NOT.
Designed by a civvy in the UKicon somewhere.

44 Pattern was all we ever preferred, it was designed for the climate back in WW2 and did what it said on the box!
We ditched the Prismatic compasses as they filled with rain, and ALWAYS navigated on SILVA shop bought at De Borras in Aldershot in the day.........crazy !! Don't think we ever bothered with NVG's as we knew the issues.
No different to the 9 Frigates tied up in Portsmouth currently cos their engines overheat in Gulf temperatures exactly where they are needed now!!