The 229th Brigade Engineer Battalion is an Engineer Battalion in the Virginia Army National Guard, part of the 29th Infantry Division's 116th Infantry Brigade Combat Team.

Personnel from the 229th Engineer Battalion were also mobilized to provide security at the Ronald Reagan Washington National Airport outside Washington, D.C. in Crystal City, Virginia, following the September 11 attacks.

The STB consisted of an HHC with platoons of Infantry, Support (Medical, Food Service and Transportation), Chemical, Military Police, Supply, Mechanics, Cavalry, Logistics and Administration.

There were three other companies in the Special Troops Battalion (Engineers, Military Intelligence and Signal).

The 189th was formerly a bridging unit, but has been reorganized as a combat engineer sapper company.