U.S. Marines with Fox Company, 2nd Battalion, 5th Marine Regiment, Regimental Combat Team 6, patrol through a poppy field during Operation Lariat in the Lui Tal district, Helmand province, Afghanistan, April 16, 2012. The Marines conducted the operation to disrupt enemy logistics and establish a presence in the area. (U.S. Marine Corps photo by Lance Cpl. Ismael E. Ortega/Released)

U.S. Marines with Fox Company, 2nd Battalion, 5th Marine Regiment, Regimental Combat Team 6, patrol through a poppy field on their way to Patrol Base (PB) Mohmon in the Lui Tal district, Helmand province, Afghanistan, April 17, 2012. The Marines joined with coalition forces at the PB to begin conducting operations in the area. (U.S. Marine Corps photo by Lance Cpl. Ismael E. Ortega/Released)

U.S. Marine Corps Lance Cpl. John K. Silvernail with Golf Company, 2D Battalion, 5th Marine Regiment, Regimental Combat Team 6, takes a knee in a field of poppy during a halt in a security patrol in Musa Qal'eh, Helmand province, Afghanistan, April 16, 2012. Marines conducted the patrol to disrupt enemy tactics in the battle space. (U.S. Marine Corps Photo by Lance Cpl. Chistopher M. Paulton/Released)

An Afghan boy stands watch over his family's poppy and wheat fields as U.S. Marines with Bravo Company, 1st Battalion, 7th Marine Regiment, Regimental Combat Team 6 patrol by in Sangin, Helmand province, Afghanistan April 24, 2012. Marines conducted the patrol to interact with the local populace and gather information on enemy activity in the area.

U.S. Marine Corps Sgt. Noel Rodriguez, a team leader with Alpha Company, 1st Battalion, 7th Marine Regiment, Regimental Combat Team 6, communicates with an adjacent squad while on patrol in Sangin, Helmand province, Afghanistan, May 1, 2012. Marines patrolled to provide security in the area and interact with the local populace.

A field filled with opium poppy plants can be seen April 11, 2012, in Marjah, Afghanistan. Heroin is derived from raw opium gum, which comes from opium poppies. (U.S. Marine Corps photo by Sgt Michael P. Snody)

A field filled with opium poppy plants can be seen April 11, 2012, in Marjah, Afghanistan. Heroin is derived from raw opium gum, which comes from opium poppies. (U.S. Marine Corps photo by Sgt Michael P. Snody)

U.S. Marines with Combined Anti-Armor Team (CAAT), Weapons Company, 2D Battalion, 9th Marine Regiment, Regimental Combat Team 5, conduct a satellite patrol through a poppy field in Marjah, Afghanistan, April 16, 2012. CAAT patrolled over a five day period to erect Patrol Base Sledgehammer Four and disrupt insurgent activity in the area. (U.S. Marine Corps photo by Lance Cpl. David A. Perez/Released)

Landscape photo of poppy flowers in Habib Abad, Helmand province, Afghanistan, April 4, 2012. U.S. Marines and Afghanistan National Army soldiers conducted a patrol to disrupt insurgency activity.

Afghan National Army (ANA) soldier conducts a satellite patrol, April 17, 2012, Marjah, Afghanistan. The ANA took part of a 5 day operation to erect Patrol Base Sledgehammer 4 to disrupt the insurgence activity in the area. (U.S. Marine Corps photo by Lance Cpl. David A. Perez/Released)

Scored poppy plants await the final harvest in Sangin, Helmand province, Afghanistan April 24, 2012. The annual poppy harvest yields the largest profit of the year for local Afghan farmers, ultimately resulting in 90 percent of the world's opium supply.

Scored poppy plants await the final harvest in Sangin, Helmand province, Afghanistan April 24, 2012. The annual poppy harvest yields the largest profit of the year for local Afghan farmers, ultimately resulting in 90 percent of the world's opium supply.

U.S. Marine Corps Lance Cpl. Michael Hanley, right, a machine gunner with 2D Squad, 1st Platoon, Bravo Company, 1st Battalion, 7th Marine Regiment, Regimental Combat Team 6, patrols through a field of poppy outside of Patrol Base Fires, Helmand province, Afghanistan April 24, 2012. Marines conducted the patrol to interact with the local populace and gather information on enemy activity in the area.

An Afghan farmer watches from a poppy field as the 288th Sapper Company, a National Guard Unit out of Houston, Miss., performs a dismounted patrol in the Uzugan province in southern Afghanistan, April 2, 2012. Dismounted patrols, in conjunction with their route clearance missions, have lead to a significant decrease in insurgent activity in the Dorifshan and Baluchi valleys and an increase in not only the safety and security of the coalition and Afghan Security Forces, but also helped the unit form a bond with the local Afghan civilians.

An Afghan National Army (ANA) soldier provides security during a satellite patrol along a poppy field in Marjah, Afghanistan, April 17, 2012. The ANA took part in a five day partnered operation to erect Patrol Base Sledgehammer Four and disrupt insurgent activity in the area. (U.S. Marine Corps photo by Lance Cpl. David A. Perez/Released)

A field filled with opium poppy plants can be seen April 11, 2012, in Marjah, Afghanistan. Heroin is derived from raw opium gum, which comes from opium poppies. (U.S. Marine Corps photo by Sgt Michael P. Snody)

A U.S. Marine with Charlie Company, 1st Battalion, 8th Marine Regiment, Regimental Combat Team 6 walks through a poppy field during a security patrol in Gorazan Valley, Helmand province, Afghanistan, April 17, 2012. Marines conducted the patrol in search of suspected enemy fighters. (U.S. Marine Corps photo by Cpl. Andrew J. Good)

U.S. Marines with Combined Anti-Armor Team, Weapons Company, 2nd Battalion, 9th Marine Regiment, Regimental Combat Team 5, conduct a satellite patrol through a poppy field in Marjah, Afghanistan, April 19, 2012. CAAT conducted a five day partnered operation to erect Patrol Base Sledgehammer Four and disrupt insurgent activity in the area. (U.S. Marine Corps photo by Lance Cpl. David A. Perez)

U.S. Marine Corps Lance Cpl. Nicholas Gonzalez, a machine gunner with 2nd Squad, 2nd Platoon, Charlie Company, 1st Battalion, 7th Marine Regiment, Regimental Combat Team 6, patrols through a poppy field in Sangin, Helmand province, Afghanistan, April 27, 2012. Marines conducted the patrol to provide security in the area and interact with the local population.