517th ADA (Air Defense Artillery) Unit Crest (We Sweep the Sky) - Sold in Pairs W-4 Chief Warrant Officer 4 This DUI was approved for

This DUI was approved for the Combined Forces Command Afghanistan in 2005

Armed Forces who performed military service during the Vietnam War and meet specific qualifications laid out by the United States Department of Defense

Criteria: These unit crests are worn by the 221st Cavalry Regiment

United States Army 105th Engineer Battalion Unit Crest (Conquer the Impossible)

517th ADA (Air Defense Artillery) Unit Crest (We Sweep the Sky) - Sold in Pairs W-4 Chief Warrant Officer 4 This DUI was approved forUnited States Army 517th ADA (Air Defense Artillery) Unit Crest (We Sweep the Sky) Criteria: Unit Crests are unique to each unit in the U. S. Army and are officially known as Distinctive Unit Insignia although most Soldiers refer to them as "Unit Crests." The insignia design is derived from the coat of arms authorized for a unit. All personnel assigned to the organization wear the insignia, except general officers, the Sergeant Major of the Army and