Ethiopia
The Ethiopian National Defense Force has only 162,000 personnel working for it. What they lack in actives, they make up for in airpower with 86 aircraft. There is also a requirement for people turning 18 to volunteer for the military, though it is not compulsory. Ethiopia has no navy, which allows for spending in other areas.
Serbia
There are 28,150 actives in the Serbian military, but less than 400 are deployed. Generally, Serbia is a very safe nation, but the defense force is in place to keep citizens protected. The army is incredibly young in comparison to most armies around the world, as it was founded in 2007!