This is from the UK but it should apply here as well.
Military covenant
The annual Remembrance Sunday, organised by the Royal British Legion, honours British troops
Britain has a 'duty of care' to its armed forces. This began as an unspoken pact between society and the military, possibly originating as far back as Henry VIII's reign. The pact was formally codified as a 'covenant' in 2000. It is not a law but is reinforced by custom and convention.
The covenant only officially applies to the army, but its core principles are taken to extend to the air force and navy too.
Soldiers will be called upon to make personal sacrifices - including the ultimate sacrifice - in the service of the Nation. In putting the needs of the Nation and the Army before their own, they forego some of the rights enjoyed by those outside the Armed Forces.
In return, British soldiers must always be able to expect fair treatment, to be valued and respected as individuals, and that they (and their families) will be sustained and rewarded by commensurate terms and conditions of service.
In the same way the unique nature of military land operations means that the Army differs from all other institutions, and must be sustained and provided for accordingly by the Nation.
This mutual obligation forms the Military Covenant between the Nation, the Army and each individual soldier; an unbreakable common bond of identity, loyalty and responsibility which has sustained the Army throughout its history. It has perhaps its greatest manifestation in the annual commemoration of Armistice Day, when the Nation keeps covenant with those who have made the ultimate sacrifice, giving their lives in action.Army Doctrine Publication Volume 5
The 'duty of c are' to troops includes paying towards healthcare, which can be physical care for injuries or mental support for Post Traumatic Stress Disorder and other problems. The Ministry of Defence also provides support for bereaved families.
The law gives the government 'combat immunity', which prevents soldiers from claiming compensation for injuries they received in combat except under official compensation schemes. Because soldiers cannot take the Crown to a civil court, the covenant is viewed as important in protecting soldiers' rights to compensation.go here for more
