The front line belong to the men who worked there—rifle-men and machine gunners, mortarman, forward artillery observers, communications men, and medics.
The military portable ECG for triage is a kind of minitype monitoring equipment for life information for the purpose that the ambulanceman carry through first aids in frontline.
To preserve their noncombatant status under the Geneva Convention, the War Department did not give medics combat pay (ten dollars extra a month) or the right to wear the combat Infantryman Badge.