Teacher evaluations...
Our son was in a slightly different situation, but the info may still apply. He's a freshman at college now, and was re-applying to the Naval Academy and applying for the first time to USMA. You are correct, the DoDMERB exam is good for two years so he didn't have to get another exam - all he had to do was ask USMA to contact DodMERB and get the results from his Naval exam the year before.
As far as teacher evals, Navy still had his original file including his high school teacher evals so all he had to do was get two more from his college Calc and English professors. He also had to get his Candidate Activities Record from high school verified again by the high school staff.
USMA was a little trickier... since it was his first application, they didn't already have HS teacher evals, but the application instructions on the WP portal clearly say that college applicants only need to get SOEs from their college profs, and that a Prof of Military Science is acceptable for the science SOE. So - he had his college profs submit their SOEs in late December, and his portal showed all green so he thought he was done.
Then in mid February, two weeks before the application deadline, USMA posted a letter on his portal saying he was missing his HS SOEs, and if he didn't submit them by Mar 1st, his file would be closed. Our son called Admissions, said instructions don't call for those, has there been a mistake? No, you have to get all 3 HS SOEs as well. and at that point, 3 more SOE slots appeared on his portal with red X's next to them. All teachers were glad to help, but for some reason the portal would not accept the SOE from his HS science teacher. He tried multiple times right up to the deadline day with no luck, and they actually closed our son's file! It finally took a call to the admissions office and staying on the line with them, while I was on another phone with the HS teacher in order to get the admissions staff to admit that they could see his SOE come into the system and get rejected by their computer. At that point they manually overrode the system and made it accept the SOE. And then they re-opened our son's file. Talk about nerve-wracking!
SO - next fall, I would have an email exchange with the Admissions Office as to whether or not you need to have HS SOEs as well as from your college profs. That way, no matter what the answer is, you'll have it in writing. And I would also suggest finishing your app as early as possible - so that the only things you need to do in December are submit in your semester grades and have your profs submit their SOEs. Also - talk to the profs early and often about your Academy goals and how important their SOEs are to your success! Best of luck to all re-applicants!