other protected veteran

Could someome give me a definition of what an "other protected veteran" is. In our AAP we refer to "disabled, disabled veterans and other protected veterans". I'm not quite sure what an other protected veteran is and can't find a good definition. Thanks.
Comments
Defined as veterans who served on active duty in the U.S. Military, ground, naval or air service during a war or in a campaign or expedition for which a campaign badge has been authorized, other than special disabled veterans or veterans of the Vietnam era. To identify the campaigns or expeditions that meet this criterion, contact the Office of Personnel Management (OPM)then it lists a number that is no longer in service.