text: Army Health System Symbols
  F-6. A control measure symbol is a graphic used on maps and displays to regulate forces and warfighting
  functions. Control measure symbols (refer to Table F-7) are organized by the six warfighting functions:
  command and control, movement and maneuver, fires, protection, sustainment, and intelligence. Control
  measure symbols generally fall into one of three categories: points, lines, or areas. The coloring and labeling
  of control measure symbols are almost identical to framed symbols
  Table F-7. Medical sustainment control measures
  Construct example and
  Control Measure Main Icon (Field A)
  symbol translation
  Ambulance exchange point
  A location where a patient is AXP
  transferred from one ambulance
  to another en route to a medical
  treatment facility.
  Ambulance control point
  A point where ambulances may ACP
  take one of two or more
  directions to reach loading
  points.
  Ambulance load point
  A point where one or more ALP
  ambulances are stationed ready
  to receive patients for
  evacuation.
  Ambulance relay point
  ARP
  A point where one or more empty
  ambulances are stationed.
  Casualty collection point
  A specific location where CCP
  casualties are assembled to be
  transported to an MTF, for
  example, a company aid post.
  Medical evacuation pickup
  point