Being drafted into the military does not ensure becoming part of the combat arms. Almost all services of the Army, such as logistics, headquarters, intelligence, accounting, etc. get draftees in time of war. However, when a draft is issued, it will typically be the combat arms that receive the most troops, as they need them the most.
Yeah, the draft is a little "fucked up," but sometimes it is necessary. Volunteer rates for the military are actually pretty low, and when it comes time for a war when manpower is needed, we will need a way of garnering more troops. Think of the draft as a necessary evil. It will only happen when it is absolutely needed.