The Corps is one of the world's largest public engineering, design, and construction management agencies. The Civil Works program employs about 23,000 full-time equivalents, with staff in headquarters; 8 divisions, which were established generally according to watershed boundaries and are headed by a division commander, who is a military officer; and 38 districts nationwide. The program covers hundreds of civil works projects nationwide and comprises water resource development activities, including flood risk management, navigation, recreation, and infrastructure and environmental stewardship. Headquarters and divisions generally establish policy and provide oversight, and districts implement projects.