Formed 1954 as a specialist maintenance and modification contractor for Douglas B-26 Invader bombers, developing high-speed executive transport and heavily armed counterinsurgency versions. The On Mark Marketeer was a six/eight-seat corporate transport based on the B-26 airframe. The externally similar Marksman had a pressurized cabin. A B-26K Counter Invader was developed for the USAF’s Tactical Air Command.
The On Mark Com¬pany took in the surplus bombers at Van Nuys, California and turned them out with everything intact but the bomb bay doors and some of the military weapons control gear. They came to the customers in pressurized and unpressurized versions, and they were only for the select few. 45-60 were converted.
The Counter-Invader was a cleaned up, heavily armed version for the USAF’s Special Air Warfare Center.
All Aero 