This is the 314th most frequent Romanian word.
militar
"Militar" in Romanian means "military" or "soldier" in English.
Here, 'militar' is used as an adjective, describing the 'corpul' (corps) as belonging to or related to the military.
Soldatul face parte din corpul militar al armatei.
The soldier is a part of the military corps of the army.
In this sentence, 'militară' is a form of the adjective 'militar', describing the type of protection as being provided by military forces.
Populația din zonă este sub protecție militară.
The population in the area is under military protection.
Here, 'militar' is used as a noun, referring to 'a person who serves in the military'.