U.S. Marines with 1st Platoon, Delta Company, 1st Tank Battalion attached to Company L, Battalion Landing Team 3/8, Regimental Combat Team 8, provides over watch in an M1A1 Abrams Tank at a vital bridge crossing in the Green Zone near Combat Outpost Ouellette, Helmand province, Afghanistan, April 6. Elements of the 26th Marine Expeditionary Unit deployed to Afghanistan to provide regional security in Helmand province in support of the International Security Assistance Force.