u/AquilaSPQR

Hi,

I've decided to ask because literally two minutes ago my dad recalled that story once again. He was a radio operator for the Polish members of the ICCS mission in Saigon in 1973. He lived in the Tan Son Nhut Airbase. He is adamant that American soldiers were using the phrase "number thirty-five" or "number forty-five" (he doesn't speak English, when he tries to repeat it it sounds like this) when they wanted to express that something was very good. I've never heard anyone (in movies or books) using it. What could it possible be?