Dan Fokker was the father of Roy Fokker.
Dan's son, Roy, was born in 1979. By at least 1990, Fokker served in the US Navy as a fighter pilot during Operation Desert Storm. He flew in the same squadron as "Pops" Hunter, where the two became close friends and shared the same fighter. Dan was killed when he failed to eject from their fighter when it was hit by an enemy blast.
After his death, Pops adopted Roy. (Robotech/Voltron 2)
Behind the scenes
Dan was first mentioned in the 2002 non-narrative reference book Robotech Sourcebook. That book listed Dan's death to have occurred during the final years of the Vietnam war -- changed to Operation Desert Storm for Robotech/Voltron.