YUMA PROVING GROUND, Arizona. A record for longest indirect fire test of a ramjet-powered artillery projectile was set by a team from Nammo and Boeing alongside U.S. Army officials — when firing a Ramjet 155 munition from a 58-caliber Extended Range Cannon Artillery (ERCA) at Yuma Proving Ground, Arizona. The test advances development efforts for the Army’s top modernization priority, Long Range Precision Fires.