I had started a thread asking when did aircrews from the SHF and AAC remember when the first gen NVGs were being used, and I think some1 said that the earliest we had them were early 70s and 103 Sqn in Singapore??
In Vietnam and Laos, the US Army and Air America had the INFANT UH-1M with LLTV, and FLIR and the 'Quiet One' also equipped with LLTV and FLIR and NVG.
Air America's Black Helicopter | Military Aviation | Air & Space Magazine
I'm guessing that anything close to resembling the avionic fits would have been undergoing experimental evaluation at Bedford/Boscombe Down/Farnborough
Though the AAC were quite forward thinking according to FG archive in 68
1968 | 0196 | Flight Archive
Airborne TV, Polaroid recon kit for instant battlefield imaging,
1968 | 0197 | Flight Archive
and Sperry Visual Target Acquisition System
Cheers