There are few reporting assignments to compare with being on the frontline of a war zone with a military unit. It is exciting, exhilarating and also dangerous. For more than two decades, western forces, particularly British and US troops, have been in constant action deployed in war zones, primarily in Iraq and Afghanistan. There has never been a busier time to be a defence correspondent and experience at first hand the challenges faced by soldiers, air force personnel and Royal Navy crews in the face of a hostile foe.