The Grumman FF or "Fifi" was a US Navy fighter. It was the first aircraft with retractable wheels to have a retractable undercarriage. It served on the USS Lexington.[1] It was the first Grumman aircraft to serve with the Navy. It had two .30 caliber Browning M1919 machine guns and could carry a 100lb bomb.[2]

Picture Credit: [3]

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