The pump: Most insulin pumps are about the size of a pager, and contain a reservoir of insulin, the pumping mechanism, battery, computer chip and screen. They are outside of the body, so they are called external pumps.
The mission of the Marine Reserve is to augment and reinforce active. Marine forces in time of war, national emergency or contingency. operations, provide personnel and operational tempo relief for the. active forces in peacetime and provide service to the community.
The Navy and the Marines are separate branches of the U.S. military. The Navy deals with control of the seas through attack, defense and transport of military equipment. The original purpose of the Marines was to capture and control beach heads, but it expanded to involve more ground combat operations.