Marines from Bravo Company, 1st Reconnaissance Battalion, pause along a tree line to survey an open area of forest they must cross. The company conducted a 10-day training exercise aboard Fort Lewis-McChord, Wash., earlier this month. - Marines from Bravo Company, 1st Reconnaissance Battalion, pause along a tree line to survey an open area of forest they must cross. The company conducted a 10-day training exercise aboard Fort Lewis-McChord, Wash., earlier this month.

Marines with 1st Battalion, 1st Marine Regiment, patrol during a squad tactics exercises aboard Marine Corps Base Camp Pendleton, Calif., April 9, 2014. The exercise gave assualtmen, mortarmen and machine-gunners an opportunity to coordinate with each other while assaulting through enemy positions during a large-scale raid. 1st Bn., 1st Marines, conducted this training in preparation for their upcoming deployment to Okinawa, Japan. - Marines with 1st Battalion, 1st Marine Regiment, patrol during a squad tactics exercises aboard Marine Corps Base Camp Pendleton, Calif., April 9, 2014. The exercise gave assualtmen, mortarmen and machine-gunners an opportunity to coordinate with each other while assaulting through enemy positions during a large-scale raid. 1st Bn., 1st Marines, conducted this training in preparation for their upcoming deployment to Okinawa, Japan.

Marines participating in the Division School's Urban Leaders Course move from one building to another while carrying a casualty during a squad tactics exercise aboard Marine Corps Base Camp Pendleton, Calif., April 9, 2014. The Marines were conducting a patrol when they received contact from instructors posing as enemies. The exercise included roadside bomb simulations, gas drills and patrols that tested the Marines' proficiency in urban combat tactics. (U.S. Marine Corps photo by Lance Cpl. David Silvano/released) - Marines participating in the Division School's Urban Leaders Course move from one building to another while carrying a casualty during a squad tactics exercise aboard Marine Corps Base Camp Pendleton, Calif., April 9, 2014. The Marines were conducting a patrol when they received contact from instructors posing as enemies. The exercise included roadside bomb simulations, gas drills and patrols that tested the Marines' proficiency in urban combat tactics. (U.S. Marine Corps photo by Lance Cpl. David Silvano/released)

Marines with Weapons Company, 2nd Battalion, 7th Marine Regiment, fire 60 mm mortars during a mortar fire exercise aboard Marine Corps Base Camp Pendleton, Calif., April 4, 2014. The unit, based out of Marine Corps Air Ground Combat Center Twentynine Palms, Calif., came to Camp Pendleton to conduct training on the different types of terrain the base has to offer. After reloading the hand-held mortar, Marines regained their sight alignment before firing the round to ensure accuracy and safety. (U.S. Marine Corps photo by Lance Cpl. Joshua Murray/Released) - Marines with Weapons Company, 2nd Battalion, 7th Marine Regiment, fire 60 mm mortars during a mortar fire exercise aboard Marine Corps Base Camp Pendleton, Calif., April 4, 2014. The unit, based out of Marine Corps Air Ground Combat Center Twentynine Palms, Calif., came to Camp Pendleton to conduct training on the different types of terrain the base has to offer. After reloading the hand-held mortar, Marines regained their sight alignment before firing the round to ensure accuracy and safety. (U.S. Marine Corps photo by Lance Cpl. Joshua Murray/Released)

Instructors with Division Schools act as an enemy soldier and a hostage during an Urban Leaders Course exercise aboard Marine Corps Base Camp Pendleton, Calif., April 3, 2014. The instructors teach junior leaders how to effectively shoot, maneuver and communicate in an urban combat environment. The course is designed to give small unit leaders the confidence to train their Marines how to operate in urban combat scenarios. (U.S. Marine Corps photo by Lance Cpl. Joshua Murray/released) - Instructors with Division Schools act as an enemy soldier and a hostage during an Urban Leaders Course exercise aboard Marine Corps Base Camp Pendleton, Calif., April 3, 2014. The instructors teach junior leaders how to effectively shoot, maneuver and communicate in an urban combat environment. The course is designed to give small unit leaders the confidence to train their Marines how to operate in urban combat scenarios. (U.S. Marine Corps photo by Lance Cpl. Joshua Murray/released)

Marines with Fox Company, 2nd Battalion, 4th Marine Regiment, maneuver around enemy positions during a squad and fire team maneuver exercise aboard Marine Corps Base Camp Pendleton, Calif., April 2, 2014. The exercise allowed Marines from the company to be evaluated on their skills while allowing them to work with various weapon systems. - Marines with Fox Company, 2nd Battalion, 4th Marine Regiment, maneuver around enemy positions during a squad and fire team maneuver exercise aboard Marine Corps Base Camp Pendleton, Calif., April 2, 2014. The exercise allowed Marines from the company to be evaluated on their skills while allowing them to work with various weapon systems.

Corporal Christopher Espinoza, an artillery section chief with India Battery, 1st Battalion, 11th Marine Regiment, leads and inspires his Marines on the firing line. He is responsible for the safety and success of the Marines operating the M777A2 Howitzer during firing exercises. Espinoza ensures that all of his Marines are well versed in their specific roles so rounds can be safely and quickly loaded and fired. (U.S. Marine Corps photo by Lance Cpl. Jonathan Boynes/released) - Corporal Christopher Espinoza, an artillery section chief with India Battery, 1st Battalion, 11th Marine Regiment, leads and inspires his Marines on the firing line. He is responsible for the safety and success of the Marines operating the M777A2 Howitzer during firing exercises. Espinoza ensures that all of his Marines are well versed in their specific roles so rounds can be safely and quickly loaded and fired. (U.S. Marine Corps photo by Lance Cpl. Jonathan Boynes/released)

Marines with Kilo Company, 3rd Battalion, 5th Marine Regiment, move to assist during a raid as part of a Marine Corps Combat Readiness Evaluation aboard Marine Corps Base Camp Pendleton, Calif., March 19, 2014. The MCCRE is a week long exercise that tests Marines' combat readiness through a variety of scenarios. Raids, gas drills and casualty evacuations are among the tests used to evaluate the Marines. (U.S. Marine Corps photo by Lance Cpl. David Silvano/released) - Marines with Kilo Company, 3rd Battalion, 5th Marine Regiment, move to assist during a raid as part of a Marine Corps Combat Readiness Evaluation aboard Marine Corps Base Camp Pendleton, Calif., March 19, 2014. The MCCRE is a week long exercise that tests Marines' combat readiness through a variety of scenarios. Raids, gas drills and casualty evacuations are among the tests used to evaluate the Marines. (U.S. Marine Corps photo by Lance Cpl. David Silvano/released)