I got this from Jerry Carlson 981st 67-68. Hope this clears up some things.
Explanation of Vietnam Campaign Ribbon
Vietnam Military Police Sentry Dog Alumni
We are the members of an elite group of proud individuals, who served our country alongside the finest soldiers that have ever walked the earth on four paws. Throughout history these four legged soldiers have diligently committed themselves to protect their fellow team members. Because of their actions they have protected vital strategic areas and have saved the lives of countless servicemen and women. With the finest tradition of the Military Police Corps the sentry dog has upheld the motto: "OF THE TROOPS, FOR THE TROOPS"