(written from a Production point of view)
Cooper is the last name of the actor who portrayed Ensign Reel in several episodes of Star Trek: The Next Generation. He received no credit for his appearances and was identified by the call sheets of the episodes.
According to the call sheets, Cooper was scheduled to appear in the fourth season episodes "First Contact" and "Identity Crisis" in scenes in a corridor and in "Qpid" and "The Mind's Eye" in scenes on the bridge and in Ten Forward but was either not filmed or cut from the final episodes. He was also scheduled to sit on the conn in the fifth season episode "Ensign Ro" and in Ten Forward in the episodes "Disaster", "Hero Worship", "Power Play", "The Outcast", and "Cost of Living" but was not seen in the final episodes.