One word of advice when in comes to the application process & standardized testing. Please understand that after June, your son will most likely not get another chance to take any form of standardized testing (ACT/SAT), IF he is planning on making the October board. If you think about it, the next SAT date for the 2013-14 school year is on Oct 5, 2013. And say that the board meets sometime mid October. Then you factor in the couple weeks it takes to process your scores. Opps - you just missed the first board.
Same thing goes for ACT; that test is administered Oct. 27th; you just missed the first board for that as well. Best chances at a 4 year scholarship will be by being "Board 1" ready. That means that if you have to take the ACT/SATs again, do it by the end of this school year.
Remaining dates for SAT:
May 4/June 1
ACT:
April 13/June 8
In regards to your technical difficulty problem - the AROTC portal is not compatible with all browsers. When I did my application, I did so using Internet Explorer (the one and only time I use that dreaded thing they call a browser ...)
Best wishes!