I'm a LECOM Army HPSP MSII, and I plan on doing half of my rotations third year with the Army. I'm doing an ADT at Tripler (yes, that's right, Hawaii), and since I live in the DC area, I will be doing 3 other non-ADT rotations at Walter Reed and Ft. Belvoir. LECOM considers any military hospital an affiliate hospital, so you can do virtually any rotations you want with the Army. They are very open minded when it comes to military, one of our professors is a Colonel so they understand the requirements and really work with you to try to work things out with rotations.
As for getting up to Erie from Ft Sam after OBC, i recommend flying, but if you can't, you should be able to make the drive in about 2 days, so make sure you have everything squared away before OBC starts. Word of advice - make sure you have everything squared away with online too - any errors could delay your orders. Have fun down there.
Congrats to everyone else who got accepted to LECOM or anywhere else. I hope you're having fun now, because you really don't have any idea what you're getting yourself into.