In contrast to the Army and the Air Force, in the U.S. Navy and U.S. Marine Corps, the Navy and Marine Corps Commendation Medal has historically considered its commendation medal to be a higher level and less frequently awarded decoration. Outside of those instances where it has been awarded for combat action with a Combat "V", it has typically been reserved for Department Head level officers at the O-4 level, senior Navy Chief Petty Officers (CPO) and Marine Corps Staff Non-Commissioned Officers (SNCO) at the E-8 and E-9 level as an "end of tour" award in a given command/organization/unit, and, following a full career, as a retirement award for enlisted personnel between pay grades E-6 and E-9. For more junior personnel, it has occasionally been awarded as an "impact award" for a significant contribution of service, to include those instances of combat service where it has included the Combat "V". In contrast, the awarding of the Army Commendation Medal in the U.S. Army and the Air Force Commendation Medal in the U.S. Air Force, is not limited to senior service members, and can be awarded to junior NCOs in the grade of E-6 and below (with some recipients as low as E-3) and junior officers in the grade O-3 and below. However, since the early 2000s, the Navy and Marine Corps Commendation Medal has been observed as being increasingly awarded to junior USN officers in pay grade O-3 as an "end of tour" award in a given command/unit/organization in a manner similar to that employed by the U.S. Army and U.S. Air Force since the late 1960s.