This question comes up every year. To date I have never seen a drop in one class, as long as it is still passing equate into rescinding the scholarship. However, if it appears that senioritis set in, and your overall GPA dropped dramatically than it could be an issue.
I will say this as a Mom with a DS that commissioned AFROTC. College is harder than HS especially when you add in ROTC, and for AFROTC SFT/EA selection. 1 D can become your make or break from a cgpa perspective.
~~~ When I saw our DS at his UPT winging two weeks ago he had stated had he had to meet this years board, he doubted he would have been selected for SFT even as an AFROTC scholarship recipient. His cgpa was 3.43, and the avg cgpa was 3.38. His ACT was 33 or 34, his SAT was 1390. His AFOQT overall was in the 90s. He was non-tech, and that is why he felt this way.
The slate will be wiped clean when you get there, but for non-tech you need to be above the average, not just a little bit, but strong above. You will only have 3 semesters for boarding purposes. One semester of 2.8 can become a stressful situation, because you will now realize you need one semester 3.8, and another at 3.4. Caveat: carrying the same amount of credits each semester.
Just putting it out there that the ante for the next round is going to be much more than the round you are playing now.
Saying this with kindness, get off the forums asking for advice, ignore your cell phone and the texts that arrive every few minutes. Hit the dang books because come next year that is what you will have to do in this scenario, better to become accustomed to the stress now than later.