Merriam-Webster Collegiate Dictionary - medevac

 I. noun  also medivac  Etymology: medical evacuation  Date: 1966  1. emergency evacuation of the sick or wounded (as from a combat area)  2. a helicopter used for ~  II. transitive verb  also medivac  (~ed; also medivaced or ~ked or medivacked; ~ing; also medivacing or ~king or medivacking)  Date: 1969 to transport in a ~ helicopter