Decker is a character who makes a one-time appearance in the Season 2 episode titled "HX-1".
Decker is one of three mercenaries working for Dunkirk, together with Joe Ganns and Handley. The group stole the HX-1 helicopter, intending to sell it to foreign buyers. Hawke first meets Decker with Dunkirk. Hawke believes Dunkirk is in touch with his brother because his brother was the last person alive who knew the tactic employed by the mercenary group during the theft of HX-1. Dunkirk tells Hawke Saint John is an MIA. Decker, rather unwisely, angers Hawke by suggesting that Hawke left his brother for "VC target practice," leading Hawke to beat him up. Dunkirk is not very sympathetic. He tells Decker (who he address as "Max") that he has a big mouth and now it is bleeding. Later Decker joins Joe Ganns and Handley in beating Hawke up outside the bar.
Decker is on hand at Red Rock Flats to demonstrate ground weapons to Dunkirk's potential customers. He is probably killed when HX-1 was shot down by Airwolf and crashed into the weapons display area.