The Orenco IL-1 was an American two-seat liaison biplane built for the United States Army by the Ordnance Engineering Corporation (Orenco). The Model E-2 was a conventional biplane powered by a Liberty 12 engine. Ordered on January 26, 1920, and designated IL-1 (Infantry Liaison) by the Army. First flown in March 1921, two aircraft were built and evaluated by the Army at McCook Field as P-147 and P-168, but the type did not enter production.