Unfortunately, no they will not. I have spoken to USMA numerous amounts of times in regards to this circumstance for myself - they will look at the best superscore of ONE test and will not mix the two. If they decide that your best test is your SAT, they will look at that superscore in total. If they decide that your best test is your ACT, they will look at that.
As a matter of fact, if I were you, I would not send your ACT composite. I have a friend who did not receive an appointment last year due to the fact that USMA reviewed his ACT as his 'best test' because his essay was so good, however his SAT held better math and English scores. I say choose your best test and stick with that, however it's up to you.