ImagesMilitary History Operation Flintlock Marines on Roi-Namur. Source: Flickr On January 31 and February1, 1944, Marines and soldiers stormed the Japanese-held beaches of Kwajelein and Roi-Namur in the Marshall Islands. In a few short days, the force would overwhelm the defenders and gain control of the Marshall Islands. February 1, 2011 Chris Carter U.S. Marine Corps, World War II