420th Engineer Brigade ( United States ) The 420th Engineer Brigade ( Corps ) is a combat engineer brigade of the United States Army based in Bryan , Texas . It is a United States Army Reserve formation and is subordinate to III Corps . Background . The brigade is a Major Subordinate Command of the 416th Engineer Command in Darien , IL . The Commander , 420th Engineer Brigade ( Corps ) commands and controls all Army Reserve engineer units in the states of Texas , Arkansas , Louisiana , Oklahoma , and New Mexico consisting of approximately 4 , 500reserve soldiers . The 420th serves as the III Corps Engineer Brigade and the commander serves as the III Corps Engineer . The units of the 420th Engineer Brigade have served in Operation Joint Forge in Bosnia , Operation Joint Endeavor in Kosovo , Operation Desert Storm in Iraq , Operation Enduring Freedom in Afghanistan , and Operation Iraqi Freedom in Iraq . They have also participated in Exercises Bright Star in Egypt , Fuerte Caminos in Honduras and Belize , and Nuevas Horizontes in El Salvador , Panama , and Guatemala . Units in the 420th are as follows : They consist of Engineer Group ( Combat ) , Engineer Group ( Construction ) , 489th Engineer Battalion ( Combat ) ( Mechanized ) , 980th Engineer Battalion ( Combat ) ( Heavy ) , 961st Engineer Battalion , 244th Engineer Battalion , 721st Engineer Company ( Horizontal ) , 955th Engineer Company ( Horizontal ) , 806th Engineer Company ( Clearance ) , 704th Engineer Company ( Clearance ) , 341st Multi - role Bridge Company ( MRBC ) , 383rd Mobility Augmentation Company ( MAC ) , 688th Mobility Augmentation Company ( MAC ) , 401st Multi - role Bridge Company ( MRBC ) , 469th Engineer Platoon ( Area Clearance ) , Engineer Detachment ( Utility ) , Engineer Detachment ( Firefighting Headquarters ) , and Engineer Firefighting Teams . Lineage . Constituted 13 February 1951 in the Organized Reserve Corps as Headquarters and Headquarters Company , 420th Engineer Aviation Brigade Activated 15 February 1951 at College Station , Texas Reorganized and redesignated 30 April 1953 as Headquarters and Headquarters Company , 420th Engineer Brigade Redesignated 8 November 1955 as Headquarters and Headquarters Company , 420th Engineer Aviation Brigade Redesignated 15 January 1957 as Headquarters and Headquarters Company , 420th Engineer Brigade Location changed 3 November 1958 to Bryan , Texas Ordered into active military service 7 December 2003 at Bryan , Texas ; released from active military service 3 June 2005 and reverted to reserve status Ordered into active military service 15 March 2008 at Bryan , Texas The 489th Engineer Battalion ( Combat ) ( Mechanized ) spent time in Iraq from 2003 - 2004 . Campaign participation credit . - A Co , B Co , C Co , D Co , HHC , FSC The 980th Engineer Battalion ( Combat ) ( Heavy ) spent time in Afghanistan from 2011 - 2012 . The 688th Engineer Co . spent time in Iraq from 2005 - 2006 . The 955th Engineer Co . spent time in Iraq from 2008 - 2009 . The 401st Engineer Co . spent time in Iraq from 2009 - 10 . The 321st Engineer Co . spent time in Afghanistan from 2012 - 2013 . The 704th Engineer Co . spent time in Afghanistan from 2012 - 2013 . The 721st Engineer Co . spent time in Afghanistan from 2011 - 2012 . The 806th Engineer Co . spent time in Afghanistan from 2010 - 2011 . Awarded Multiple Purple Hearts , CAB ' s , Bronze Stars , NAM ' s , and many other awards