In 1906 this search for a better handgun to shoot the .45 ACP led to military test trials. Six firearms manufacturing companies submitted pistols. Of the six, three were eliminated early on, leaving a Savage, Colt, and DWM chambered in .45 ACP. These three handguns still needed tweaks, but only Colt and Savage resubmitted their designs. Field tests from 1907 to 1911 were held to decide between the Savage and Colt designs. Six thousand rounds were fired from single Colt and Savage pistols over the course of two days. When the guns began to grow hot they were simply immersed in water. The Colt passed with no reported malfunctions. The U.S. Army then adopted the Colt Model 1911 on March 29, 1911, thus gaining its designation, Model 1911. The U.S. Navy and Marine Corps adopted it in 1913.