I just did. I'm British but live in the USA. we just went home for a few weeks holiday and took my drone. No issues what-so-ever bringing it back into the USA.
I realize the question is not directed to me but my two call signs are VU2VIM and G0KUA, never obtained a call sign in the US; was very active from very early 80's through late 90's, sold almost all my radio equipment although still have a few...