The Pentagon's inspector general is resigning after just over a year in the job to take a teaching position at George Mason University and the top investigator at the Labor Department has been picked to fill the post.

The Defense Department announced the changes Wednesday. It comes as defense spending has skyrocketed but personnel shortfalls in the IG's office have strained its ability to probe allegations of waste, fraud and abuse in military programs.

Claude Kicklighter, who took over as Pentagon inspector general in April 2007, will be replaced by Gordon S. Heddell, who has been the Labor Department's inspector general since January 2001.