F4U1a Corsair with bomb

The Vought F4U-1A Corsair was primarily used by the U.S. Marine Corps and U.S. Navy in the Pacific Theater during World War II (1943–1945), acting as a land-based fighter-bomber for island-hopping campaigns. It also served with the Royal New Zealand Air Force and the British Fleet Air Arm. 
 
Pacific Theater Operations: The F4U-1A, with its bubble canopy (replacing the "birdcage" frame), was used extensively in the Solomon Islands, Rabaul, New Guinea, Marshall Islands, Peleliu, Philippines, and during the battles for Iwo Jima and Okinawa.
Key Roles: Known as the "Whistling Death" to the Japanese, it was used for air-to-air combat against Japanese Zeros, ground attack, and escort missions, providing crucial air superiority for the Marines.
Units: Famous squadrons like VMF-214 (the "Black Sheep") used the Corsair to achieve a high victory-to-loss ratio.
Other Theaters: While primarily used by the U.S. in the Pacific, the Royal Navy Fleet Air Arm operated Corsairs in the Indian Ocean and North Sea. 
 
The F4U-1A was specifically designed to improve pilot visibility, making it a preferred model for both land-based Marine squadrons and carrier-based operations later in the war.