Was the HK G3 used in the Vietnam war?

The Australians and New Zealanders used an FN, which may have looked similar to the HK. The primary NON-WW2 rifles used in the Vietnam War were:

M14

M16; XM177E1; XM-177E2; CAR-15; M203; M700; M60; M79

Special forces: HK33; M3; S&W; ....

To much to say, The seals could buy their own weapons, so there was a variety

Australian-FN (edit, L1A1)

NVA/VCzhyphenzSKS & AK-47