Tennessee Titans tight end Delanie Walker JUST returned from a trip with the U.S. military -- and says he realized he played college football against one of the soldiers!

Walker was part of a USO tour to various U.S. military bases in the Middle East, Asia and North America -- where he learned how to fire weapons, ride camels and even threw around the pigskin!

In fact, Walker and Cam Jordan even hit some trick shots -- involving a basketball hoop!

In the end, Walker said he LOVED the trip and has even more respect for our troops.