The 3d Combat Engineer Battalion deployed to the Republic of Vietnam landed at Chu Lai in July 1965 and later moved to Da Nang remaining in country until October 1969.

[2] During this time the battalion operated from Da Nang, Đông Hà, Gia Le, Quang Tri, Cửa Việt, Camp Carroll, Cam Lộ, and the Vandegrift Combat Base.

1st CEB supported Taskforce Ripper, [the lead element of 1st Mar Div during Desert Storm].

"Alpha Company '3rd" also supplied a squad of engineers to conduct breaching operations for Task Force Shepard.

The company, minus its 2nd Platoon, deployed to Iraq in support of Operation Iraqi Freedom and fell under the command of Regimental Combat Team 5 during 2008.

Alpha Company was then dispatched across Helmand Province including the districts of Marjeh, Musa Qala, and the infamous battle of Sangin.

3d Combat Engineer Battalion deployed to Helmand Province, Afghanistan in support of Operation Enduring Freedom during 2010, 2011, and 2013.