My DS was in your situation (also active duty Marine) last year. He opted to wait to submit his new scores. He took both ACT & SAT on base in Japan. Be advised, the SAT scores are a little slower to come in when they're taken through the base. He was anxiously waiting for them to post on the USNA candidate profile. I recommend taking both tests at the next available test dates. Fyi...fortunately, my DS did well on both even after being out of school for two years. He ended up with an LOA, followed by a color blind waiver to NAPS where he is excelling. Thought you might like to hear some positive results of applying as active duty USMC. Best of luck to you.