Combat Medical Badge

The Combat Medical Badge is an award of the United States Army which was first created in January 1945. Any member of the Army Medical Department, at the rank of colonel or below, who is assigned or attached to a ground combat arms unit of brigade or smaller size which provides medical support during any period in which the unit was engaged in ground combat is eligible for the CMB. According to the award criterion, the individual must be performing medical duties while simultaneously being engaged by the enemy; strict adherence to this requirement and its interpretation (e.g., distant mortar rounds vs. direct small arms fire) will vary by unit. As of 3 June 2005, Special Forces medics are no longer eligible for award, but may now receive the Combat Infantryman Badge. A revision has allowed aviation medics to be eligible for the CMB. The non-combat proficiency equivalent is the Expert Field Medical Badge.
Appearance.
The Combat Medical Badge is one inch tall and one and a half inches wide.
History.
The Combat Medical Badge is retroactive to 6 December 1941. The original decoration was considered a one-time decoration, however this directive was rescinded in 1951 allowing for multiple awards of the Combat Medical Badge denoted by stars encircling the decoration. According to the US Army Medical Department Regiment, to date there have been only two soldiers that have earned the Combat Medical Badge with two stars: Henry Jenkins and Wayne Slagel. The directive was again altered in 1969 to specify that only one award of the Combat Medical Badge is authorized for service in "the Vietnam Conflict Era", which included service in Vietnam and Laos, the Dominican Republic, and South Korea (subsequent to 4 January 1969). Current regulations have expanded this qualifying period to include service in El Salvador, Grenada, Panama, Southwest Asia, and Somalia, and have added an additional qualifying period ("the Global War on Terror Era") covering service in Iraq and Afghanistan.
In 1947, a policy was implemented that authorized the retroactive award of the Bronze Star to soldiers who had received the Combat Medical badge during the Second World War. The basis for doing this was that the Combat Medical Badge was awarded only to soldiers who had borne combat duties befitting the Bronze Star Medal and also that both awards required a recommendation by the commander and a citation in orders.
The CMB is authorized for award for the following qualifying
periods:
"World War II Era"
"Korean War Era"
"Vietnam War Era"
"Global War on Terror Era"
As of 2005 the rules for eligibility were changed to allow any medical department soldier in a brigade or lower unit to be eligible so long as they are engaged in actual ground combat and performed medical duties. This now includes Soldiers assigned to aviation units. Additionally, in 2008, IED/VBIEDs can now be considered direct contact with the enemy. 
As of June 2011, the badge and its sew-on equivalent may be worn on the Army Combat Uniform (ACU).