U.S. Navy Diver 2nd Class Michael Gerstel, a handler assigned to the Marine Mammal Company of Explosive Ordnance Disposal Mobile Unit, rewards a bottlenose dolphin after a successful training evolution at Joint Expeditionary Base Little Creek-Fort Story, Va., on June 8 during Frontier Sentinel 2010. About 2,500 Canadian and U.S. military personnel and government civilian agencies are participating in the annual maritime homeland security training exercise. (DoD photo by MC1 Bruce Cummins, U.S. Navy/Released)

U.S. Marines and Estonian soldiers wade ashore during a combined U.S., Estonian amphibious landing at a beach here. The combined training demonstration was part Baltic Operations 2010, an exercise designed to increase the interoperability of NATO and partner nations in the Baltic Sea region. (Photo by Sgt. Rocco DeFilippis)

SPC Jonathan Luke chokes down a turkey sandwich in the back of a blackhawk helicopter at Ft. Carson, Colo., during HAMETS (High Altitude Mountain Environmental Training Strategy) with the 10th CAB, 10th Mountain Division. The CAB was in Colorado Springs for the training before their deployment to Iraq.

A Soldier from 10th Mountain Division holds his position during a rock drill for a mission later in the day at Ft. Carson, Colorado Springs, Colorado on Thursday, June 10, 2010.

Mementos left at the base of one of the panels at the Ft. Carson Mountain Post Global War on Terrorism Fallen Soldiers Memorial.

U.S. Marines watch and snap photos as amphibious assault vehicles come ashore during operation "Dawn Blitz" at Camp Pendleton, Calif., Friday, June 4, 2010. About 5,000 Marines and Navy sailors participated in the largest amphibious exercise on the West Coast since the Sept. 11, 2001, terrorist attacks. (AP Photo/Chris Carlson)

U.S. Marine Pfc. Marc Calo lays in the surf after coming ashore during operation "Dawn Blitz" at Camp Pendleton, California. Friday, June 4, 2010. He was one of about 5,000 Marines and Navy sailors who participated in the largest amphibious exercise on the West Coast since the Sept. 11, 2001, terrorist attacks. (AP Photo/Chris Carlson)

President Barack Obama is saluted as he boards Air Force One at Andrews Air Force Base, Md., Friday, June 4, 2010, en route to the Louisiana Gulf Coast region where he will visit areas affected by the BP oil spill. (AP Photo/Charles Dharapak)

HELMAND PROVENCE (May 17, 2010) A sandstorm approaches Camp Leatherneck, Afghanistan. Marines and Sailors are in the Helmand Province supporting Operation Enduring Freedom. (U.S. Navy photo by Mass Communication Specialist 2nd Class Ace Rheaume/Released)

Deborah Higgins, mother of LCPL James Higgins, rides a custom Harley Davidson that bears the awards worn by her son who was killed in Anbar Province, Iraq, on July 27, 2006, during the Rolling Thunder motorcycle event on Sunday, May 30, 2010. The bike is adorned with hand-painted portraits of LCPL Higgins as well as a seat made from the door of the Marine's HMMWV.

Crew chiefs complete their final checks May 19, 2010, before these C-130 Hercules aircraft take off from Nellis Air Force Base, Nev., for a mobility exercise over a nearby training range. The exercise is part of the larger bi-annual U.S. Air Force Weapons School Mobility Air Forces exercise. (U.S. Air Force photo/Airman 1st Class Brett Clashman)