I talked to my classmate who went to the Air Force Academy about my journey. Here’s what she said.
1) I should have returned the salute of the guard, but it’s OK that I didn’t. She forgot they do that last time she went there, and when she returned the salute, she hit herself in the eye.
2) Since I wasn’t in uniform, I should just have stood at attention during the national anthem. If I was in uniform, I should have saluted.