Captain

In the United Stars uniformed services, captain is a commissioned officer rank. In keeping with the traditions of the militaries, the rank varies between the services, being a senior rank in the naval services and a junior rank in the ground and air forces.

For the Union Navy  a captain is a senior officer of pay grade O-6 (the sixth officer rank), typically commanding Translight capable vessels, space fighter commands and shore installations.

For Army and Marines, a captain is of pay grade O-3 (the third officer rank), usually serving as the commander of a company-sized unit in the ground forces, as a flight leader or other squadron officer in units, or serving as an executive officer or staff officer for a larger unit such as a battalion or squadron.

The rank of captain may also be used in other organizations outside of the military, particularly in fire departments, police, and law enforcement.

