From 2005 Chesarek began participation in an exchange program between the USMC and their counterparts in the Royal Marines. As a weapons and tactics instructor he joined 847 Naval Air Squadron of the Royal Navy'sCommando Helicopter Forcelearning to fly the Westland Lynx in support of 3 Commando Brigade. In June 2006 he was a Captain when along with the rest of 847 NAS he deployed to Basra, Iraq. Flying a Lynx AH.7 helicopter on the evening of June 10, 2006, Chesarek was providing radio communication relay for British ground troops conducting a company-sized search operation near Amarah, Iraq. Monitoring radio transmissions, he overheard that a vehicle involved in the operation had become disabled and a crowd of insurgents was firing small arms and rocket-propelled grenades at the company. His award citation tells, "Chesarek elected to fly low over the area in an attempt to distract the crowd and if possible, to engage the insurgents." Because the crowd of civilians was so close to the ground troops, he decided that instead of engaging his machine gun, he "opted instead to provide bold, harassing, very low level flight over the area in an attempt to disperse the crowd." However, Chesarek learned from radio traffic from the ground that he was now the target and was drawing weapons fire, and that a rocket-propelled grenade had just missed the tail of his helicopter. Using his view from the air, Chesarek, who was trained as an airborne forward air controller, then used his skills to coordinate, designate and control fixed-wing aircraft in providing close air support, which resulted in dispersing the insurgents. Chesarek, aware that a British soldier, Colour SergeantIan Page, had been critically injured with a gunshot wound to the head, then made the decision that as the only helicopter in the area he would conduct a medical evacuation with the Lynx despite his version of the aircraft type not being designed for this use. Landing the Lynx near the soldier in distress, his door gunner and another crew member jumped out, picked up the injured soldier and put him into the aircraft. The other crew member who disembarked elected to stay on the ground so the helicopter would not then be forced to fly overweight. As a result of his actions that day, he was awarded the British Distinguished Flying Cross. The award was announced by the British Ministry of Defence on December 15, 2006. He received the award from Queen Elizabeth II at Buckingham Palace on March 21, 2007. After which Chesarek reflected on his lost comrades and brothers in arms saying:
I am greatly honored and would like to accept this prestigious award for 847 NAS in memory of Lt. Cmdr. Darren Chapman, Capt. David Dobson, and Marine Paul Collins, who were killed in action over Basrah in May 2006,
He continued:
The awarded actions were only possible due to the combined effort of my combat crew; Lt. David Williams and Lance Cpl. Max Carter. My greatest sense of achievement that day is in knowing the ground troops all made it home.
Michelle Norris, the young British medic who initially aided Page, received her Military Cross at the same ceremony. Chesarek is the first US serviceman to receive this significant British decoration since the end of the Korean War.
