Christopher Lynch, a builder constructionman with Naval Mobile Construction Battalion-40, Detachment-Horn of Africa, hammers a nail into the future roof for the Charichcho Primary School. 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.