Any Ideas??? dress help for Army basic graduation

So next month im going to my boyfriends soon to be husbands Army basic training graduation. I have no idea what to wear. Have any of you been or know what to wear or simply just have any ideas of what I could wear? Any ideas pics of dresses or outfits would be super appreciated!!😃 oh and I prob won't wear heels because that's the only thing I've been told not to wear. I have no idea what to expect.