Marines with Mobility Assault Company, Combat Engineer Battalion, 2nd Marine Division exit their tanks at the completion of the breaching and clearing course September 12, 2013. Marines with Combat Engineer Battalion 2nd Marine Division participated in a week long field exercise in which they had to implement four basic combat engineer task being mobility, counter mobility, assault and general engineering. - Marines with Mobility Assault Company, Combat Engineer Battalion, 2nd Marine Division exit their tanks at the completion of the breaching and clearing course September 12, 2013. Marines with Combat Engineer Battalion 2nd Marine Division participated in a week long field exercise in which they had to implement four basic combat engineer task being mobility, counter mobility, assault and general engineering.