TC;
There is no problem wearing this kit whatsoever for the operative so lets quash that rumour.
I have a fair few hours myself on mil NVG with no 'after effects', less the temporary 'brown eye'!, however with the profiles that I fly these days, (transit to scene - max 10 mins - orbit for hour+ looking down and right - or pursuit with head looking right and rear constantly for perhaps up to 45 mins, then 10 min transit back), I cannot see there not being any neck fatigue/strain issues.
Perhaps those already using NVIS have different sortie profiles day to day, but this possible RSI should be seriously considered.
By the way, scenario - unit with Stage1 only has to land in the Ulu.
Revert to mortal, correct?
(NVG above 500ft wasn't even logged in days gone by!)
SS