Militia service for Alabama, Georgia or any state was like belonging to a jury pool. Free male citizens in a certain age range belonged to the militia of their home county. By law they were required to appear for muster, patrol and drill at certain times. No one was paid for this -- it was something most citizens were expected to do. If a man failed to appear without a proper excuse, they could be fined.
County road duty was similar in that respect -- it was something you were required to do without pay.
However, if the governor called a militia organization into service, officers and men were paid at the end of their term of service. Term of service was limited by law to a specific period, such as ninety days. Laws of each state would vary as to term of service &c.