You are lucky then , the ones we had in the CF were aluminum I believe!! May explain a few things !!!!

Ours had that black almost graphite like black smudge stuff inside where the plastic canteen sat and touched the sides of the metal, and did not smell like SS. You did not always have time to clean it out when you stopped for a brew up, get into you and get on the move again..

No wonder dropped fly hooks sometimes stick to my belly!!!!!

SS = Stainless Steel.