Name the character part played by Charlie Sheen in the film "Hot Shots" (1991)?

"Hot Shots!" is a 1991 comedy film which stars Charlie Sheen, Cary Elwes, Valeria Golino, Lloyd Bridges, Jon Cryer, Kevin Dunn, Kristy Swanson, and Bill Irwin. It was directed by Jim Abrahams, co-director of Airplane!, and was written by Abrahams and Pat Proft. It was followed by a sequel, Hot Shots! Part Deux in 1993.

The film begins at Flemner Air Base 20 years in the past. A pilot named Leland "Buzz" Harley (Bill Irwin) loses control of his plane and ejects, leaving his co-pilot Dominic "Mailman" Farnum (Ryan Stiles) to crash alone; although Mailman survives, he's mistaken for a deer owing to the branches stuck to his helmet and is shot by a hunter. Topper Harley (Charlie Sheen) wakes up from a nightmare he's having about the event when Lt. Commander Block (Kevin Dunn) asks him to return to active duty as a pilot in the U.S. Navy, to help on a new top secret mission: Operation Sleepy Weasel. Harley starts to show some psychological problems, especially when his father is mentioned. His therapist, Ramada (Valeria Golino), tries to keep Topper from flying, but she relents, and also starts to build a budding romance with Topper. Meanwhile, Topper gets into a rivalry with another fighter pilot, Kent Gregory (Cary Elwes), who hates Topper because of the loss of his father "Mailman" to Buzz Harley, and believes Topper may do the same to him.