I spoke with 1st Lt. Caleb Campbell yesterday to find out where he is in the process of leaving active duty and pursing a career in the NFL. Campbell is still on active duty and is stationed at Fort Sill, Okla., where he’s completing the Army’s BOLC II course. Graduation is scheduled for July 16, and the tentative plan is to leave active duty after that and join a field artillery unit in the Michigan National Guard. Campbell says all of his paperwork has been filed, and that all that’s left to do is graduate. On Thursday, Campbell is heading…