Petty Officer 3rd Class Karl Rabbass, a builder with Naval Mobile Construction Battalion-40 Detachment-Horn of Africa, uses a mallet to make sure the cement block fits securely before the mortar and cement mixture dries on one of the walls for the new school building. NMCB-40 Detachment Horn of Africa is in the middle of a six-month deployment supporting the Combined Joint Task Force-Horn of Africa mission to prevent conflict, promote regional stability, protect coalition interests, and prevail against extremism in east Africa and Yemen through humanitarian assistance, disaster relief, consequence management, military-to-military training, civic action programs to include medical and veterinary care, school and medical clinic construction and water development projects.