Drilling mud - Defense imagery management operations center

U.S. Navy Equipment Operator 2nd Class Casey Rider, assigned to Naval Mobile Construction Battalion (NMCB) 74, checks the consistency of drilling mud, a mixture used as a lubricant and a coolant, while removing cuttings during drilling in Shaba, Kenya, April 22, 2008. Seabees with NMCB-74 planned to drill three water wells for villagers in Garissa district during a six-month deployment to Combined Joint Task Force-Horn of Africa. (U.S. Navy photo by Mass Communication Specialist 3rd Class John Hulle/Not Released)