I have a friend who lives in the neighbourhood of the Stuttgart military base. Although she herself has had daughters, she asked me about circumcision once. I wanted to know why she was interested and she said 3 of her friends (one of whom had married a US soldier, the other two who'd had relationships with military personnel) had had their infant sons circumcised as a direct result of this exposure (my friend was jealous that she'd never experienced a circumcised partner).
So in the very limited experience of an expat living in Germany with not a lot of local contact at a level that allows me to talk about sexually intimate subjects, n = 3.
Extrapolate that out a little and it's not too much of a stretch to think there's some truth to this belief.