Defense Play (1988)

"Defense Play" is a 1988 Action movie directed by Steve Greenberg and starring by David Oliver, Susan Ursitti. Professor Vandemeer works on a secret project for the US-Air-Force called DART: a very small helicopter for scouting and defense. When he gets killed, Colonel Denton gets under suspicion. His son Scott and Vandemeer's daughter Karen believe in his innocence and search for the true murderer and his motives.