Country music is as American as football / apple pie / insert-any-other-cliche-phrase-here, so it makes sense that, from time to time, the genre's artists would don some patriotic clothing.
Early in their career, the Zac Brown Band considered Kenny Chesney to be a mentor. In fact, the superstar helped them out of one very tough situation. Just don’t ask Chesney about it, because he won't remember.