In the late 1930s, Gulf's aviation manager, Maj. Alford J. Williams, had the Grumman Aircraft Engineering Corporation construct two modified biplanes, cleaned-up versions of the Grumman F3F Navy fighter, for promotional use by the company. Wearing Gulf Oil company colors and logos, the Grumman G-22 "Gulfhawk II", registered "NR1050", was delivered in December 1936, and in 1938 Maj. Williams flew it on a tour of Europe. A second scavenger pump and five drain lines were added to the engine installation that allowed the aircraft to be flown inverted for up to thirty minutes. This aircraft is now preserved in the National Air and Space Museum in Washington, D.C. A second airplane, the Grumman G-32 "Gulfhawk III", registered "NC1051", was delivered on May 6, 1938. Impressed by the Army Air Force in November 1942 for use as a VIP transport and designated a UC-103, it crashed in the southern Florida Everglades in early 1943.