Being a military family living in Germany, we're constantly bombarded with information screaming at us to "blend in, don't stand out from the locals, yadda, yadda, yadda". And I truly believe that this information is meant for those service members living here without children. Although I don't know what makes us stand out more, my kids babbling 100 miles/hr in English or my husband's Chevy hat that he wears so proudly atop his head!
We're told to try to speak the local language when on the economy (meaning 'off base') and doing shopping or sight-seeing. Well that's fine and dandy...until your kids answer you back loudly AND in English. I mean, there's nothing like asking the restaurant manager, "Wo ist das tolietten?" and then having your child loudly announce, "MOMMY!!! I have to PEEEE.....NOW !!!!" and you just happen to be in the middle of some po-dunk German village on your way to Belgium.
The area we are currently in, thankfully has a high tolerance for our American presence here. And rightly so, for the most part, as the Americans stationed here bring in a ton of money for the Germans. Many of us live on the economy and are paying ridiculous amounts of rent and utilities for the homes we occupy. So most of the time, we don't really have to worry about 'blending in', the Germans know and accept that we're here and are more than happy to take our euros!!