I don't believe he does. All I know about this is an article from the March 24, 2008 issue of Sports Illustrated.
Pertinent excerpts from the article:
[i][b]War Games: A West Point cadet may fulfill his Army obligations by playing in the NFL[/b] by Clay Travis
...But Campbell's path may soon diverge sharply from his classmates'. Earlier this month he attended the NFL combine in Indianapolis, where he wast he first Army nonkicker ever invited. Like every participant he hopes to be drafted by an NFL team next month, but Campbell has more riding on that draft than most. He could be playing professionally next season. But if he isn't taken or doesn't make an NFL team as an undrafted free agent, he'll likely be serving as a second lieutenant in Iraq or Afghanistan by the end of the year. Such is life on the banks of the Hudson River in a time of war.
In the past, star athletes at military academies (Navy's Roger Staubach and David Robinson, for example) had to put pro sports careers on hold while they fulfilled their service obligations. (Staubach served four years, including one in Vietnam; Robinson served two years at a base in Georgia, and then four as a reserve while playing in the NBA.) Campbell owes his chance to pursue his NFL dreams to a policy implemented by the Army in 2005 that releases cadets from their five-year active duty commitment if they "unique talents and abilities." It requires them only to "participate in activities with potential recruiting or public affairs benefit to the Army."
If he's drafted, Campbell will serve as a recruiter for the Army during and after the NFL season, speaking to young people and working at the local recruiting office wherever he plays. (He would be excused from his five-year service commitment.) If he doesn't hook on with a pro team within a year, he'll return to the Army for five years.
The policy's rationale is straightforward: West Point grads wit highly visible talents create positive publicity for the Army, an aid to recruiting at a time when the military can be a hard sell. Josh Holden, a minor leaguer for the Cincinnati Reds, was the first Army graduate to benefit, in 2005. Campbell would become the first football players to receive the exemption, a distinction that makes him uncomfortable. "I came here after 9/11; I knew what to expect," he says. "We've been trained to lead troops into battle. I expected to do that. I didn't expect the Army to give me an opportunity to play in the NFL. But the difference gets to you. My best friends are probably going to be in Iraq soon."[/i]
I hurriedly copied that out of the magazine and didn't proofread it, so any typos are mine.