Redesignated 31 August, as Headquarters and Service Company, 4th Engineer Battalion, 4th Marine Division.

Reactivated on 1 November 1951 at Baltimore, Maryland, as Headquarters Company, 1st Engineer Battalion.

Called to Active Duty December 1990 to participate in the Persian Gulf War.

In January 2003 the Battalion activated and deployed personnel in support of the initial invasion of the Iraq War (Operation Iraqi Freedom).

December 2004 activated and deployed personnel to serve as members of the 5th Civil Affairs Group and continue to support Operation Iraqi Freedom and Operation Enduring Freedom.