A United States Army captain in the episode Little Green Men, the suspicious security officer who wants Quark, Rom and Nog interrogated by force after their ship crashes in 1947.
Captain Wainwright is an American army officer in the fourth-season episode Little Green Men. When an accident throws Quark's shuttle back to Earth in July 1947 and the three Ferengi are taken to a military base in New Mexico, Wainwright is the officer responsible for security there under General Denning.
While Professor Carlson and Nurse Garland hope for peaceful contact, Wainwright assumes the visitors are scouts for an invasion. Quark's clumsy attempts to sell technology and his empty threats of a Ferengi fleet only deepen that view.
Wainwright has the three strapped down, injected with truth serum and threatened with a knife. Before he gets further, Odo, who had stowed away, frees them with the help of Carlson and Garland, and the Ferengi fly home.