a military force whose members are trained soldiers but who often have other jobs
https://dictionary.cambridge.org/us/dictionary/english/militia
1
a : a part of the organized armed forces of a country liable to call only in emergency
The militia was called to quell the riot.
b : a body of citizens organized for military service
2 : the whole body of able-bodied male citizens declared by law as being subject to call to military service
3 : a private group of armed individuals that operates as a paramilitary force and is typically motivated by a political or religious ideology
specifically : such a group that aims to defend individual rights against government authority that is perceived as oppressive
https://www.merriam-webster.com/dictionary/militia
Always in the context of a group, military or paramilitary