take over casualties of a battalion aid station that is forced to move before these casualties can be evacu- ated. It may be established in the area of the regi- mental reserve so that the section with the reserve may remain in readiness for movement. In some situations, the regimental aid station is not estab- lished, and headquarters section personnel may be used elsewhere. This group serves as a source of re- placement and reinforcement for the battalion sec- tion.
(2) A battalion aid station is established by a battalion section to serve a battalion, including any supporting personnel in the battalion area.
b. Considerations affecting selection of site. (1) Desirable features sought in selecting an aid station site (fig. 4) are-
Protection from flat-trajectory fire.
Convenience to troops being served.
Economy in litter carry.
Proximity to natural lines of drift of walking
Accessibility to supporting medical troops.
Facility of future movement of the station
to the front or rear.
Proximity to water.
Protection from the elements.