Dyess Army Airfield (ICAO: PKRO, FAA LID: ROI,[2] also known as Freeflight International Airport)[citation needed] is a military airfield on Roi-Namur, Kwajalein Atoll, Marshall Islands.

[3] When the Japanese took control of the island during World War II they built an airfield that took the form of the number "4."

The Japanese designated the runways A, B, and C, with A being the vertical leg, B being the diagonal and C intersecting at a right angle to A.

On September 19, 1950, the Marshall Islands' worst aviation accident happened near Dyess.

A Douglas R5D-3 (56496) of the US Navy crashed into the Pacific shortly after takeoff from runway 07 on what was supposed to be a flight to Tokyo, killing all 26 onboard.