I can't help anyone on the ARC process, but boy howdy! I can talk reams about twins, identical, mirror image.
Their goal was to two-fold as high school seniors: Go to college together, and to go for FREE.
It really came down to the wire since one guy did not find out until the absolute last second, while the other son had gotten the LOA on their October birthday the year before. I can't remember now but I think their second choice was Notre Dame
In the class of 2012, three sets of twins graduated!
From my perspective, it was much easier as a mom having them together, from getting on that plane the day before I-Day, to graduation day, pinning on those bars, on the field at Falcon Stadium.
I think the hardest thing for them was that first summer, when USAFA did not seem to find any wisdom in having them have their leave at the same time, and it was the first time I ever heard each guy say, "I miss my bro."
Now that they are 2nd LTs, they live a continent apart though I believe they still talk frequently.
They did have fun when one was an element leader at BCT, and he was having his basics do what I think are called "superman drills" (change uniforms as fast as they are able.). Well, Twin A said, "OK Basics, time me! I'm telling you I can change in the blink of an eye!" So, Twin A in ABUs walked into a room, counted to 10, and then TwinB walked out all dressed up in Service Dress. Those basics 'bout fainted!!! All except one very perceptive female basic who said NO WAY! That was a good twin day!
They did have very many friends in common, and some friends who "belonged" just to one twin or the other.
Was difficult for us sometimes as parents because we made the commitment to pay for their transportation to and from home, books (4* year), and a few other expenses. As usual, almost everything was multiplied by two, so that $690 Thanksgiving plane fare got turned into almost $1400 in a blink.