An AN/TWQ-1 Avenger air defense system fires a missile over the Black Sea at Capu Midia Training Area, Romania on July 19, 2017. The drill allowed gunners to fire live missiles as part of Tobruq Legacy, an air defense exercise where the US and its NATO Allies and partners share new knowledge, techniques and strategies to enhance air defense capabilities in Eastern Europe. (Photo by U.S. Army Pfc. Nicholas Vidro, 7th Mobile Public Affairs Detachment)

US Army Pvt. Noah Litteer, a gunner with Company C, 2nd Battalion, 263rd Air Defense Artillery, 263rd Army Air & Missile Defense Command, explains the targeting system of his AN/TWQ-1 Avenger air defense system to Lt. Gen. Ben Hodges, commander of US Army Europe, before a live fire demonstration over the Black Sea at Capu Midia Training Area, Romania on July 19, 2017. The event was a part of Tobruq Legacy, an air defense exercise where the US and its NATO Allies and partners share new knowledge and techniques to enhance air defense capabilities in Eastern Europe. (Photo by Army Pfc. Nicholas Vidro, 7th Mobile Public Affairs Detachment)

US Army Pvt. James Fricks, a gunner with Company C, 2nd Battalion, 263rd Air Defense Artillery, 263rd Army Air & Missile Defense Command, slides into the gunner's seat of an AN/TWQ-1 Avenger air defense system in preparation for a live fire demonstration at Capu Midia Training Area, Romania on July 19, 2017. The event was a part of Tobruq Legacy, an air defense exercise where the US and its NATO Allies and partners come together to enhance air defense capabilities in Eastern Europe by training together and sharing techniques and procedures. (Photo by U.S. Army Pfc. Nicholas Vidro, 7th Mobile Public Affairs Detachment)

A MIM-23 Hawk missile system fires a missile over the Black Sea at Capu Midia Training Area, Romania on July 19, 2017. The Romanian missile system fired alongside American troops and weaponry, allowing each country to witness each other's abilities. The live fire exercise was part of Tobruq Legacy, an air defense exercise where the US and its NATO Allies and partners come together to enhance air defense in Eastern Europe by training together and sharing techniques and strategies. (Photo by U.S. Army Pfc. Nicholas Vidro, 7th Mobile Public Affairs Detachment)