The 1st Combat Engineer Battalion performs many specific functions while fulfilling its mission of providing both tactical and logistical engineer support to the 1st Marine Division. These include engineer reconnaissance; temporary road repair; erection of prefabricated bridges; construction of bridges from available materials; construction of rafts and obstacles; supervision of the placement and cleaning of mine fields and fortifications; demolition; obstacle breaching from the high water mark inland; and supervision of major camouflage operations. The battalion shares the San Mateo (62) Area with the 5th Marine Regiment.