From the Washington Times:

The size of the federal air marshal force has been cut in half by on-the-job injuries that have sidelined nearly 2,100 marshals, while squabbling prevents health and safety policies from being implemented, government officials say.
Marshals say medical staffers are quitting the Federal Air Marshal Service (FAMS) out of frustration as hundreds develop illnesses related to their heavy flying schedules such as barotrauma, decompression sickness that causes ruptured eardrums and sinus conditions often requiring surgery.