Military vessel
A military vessel or military ship was any type of starship dedicated for military use. 

Degra was impressed with the sensor scans that Captain Jonathan Archer produced of the first Sphere  had come across after entering the Delphic Expanse in 2153. Degra thought that "These scans are remarkably detailed for a military vessel," to which Archer explained, "Enterprise was designed to be a ship of exploration." ()

After being shown their quarters aboard K'Vada's Bird-of-Prey, Data inquired whether the quarters were Captain Jean-Luc Picard's or his own. Klingon Captain K'Vada explained that it was in fact "both", as his ship had "limited space," because "We are a military ship, not a pleasure craft." ()

When several unidentified  Cardassian warships were identified in the Orias system in 2371, Gul Dukat asked the Obsidian Order observer, Korinas, whose ships those were. She feigned knowledge of why he would ask her, before he explained that "if they were military ships, I would know about them. So that leaves the Obsidian Order." ()

Types of military vessels 
 Arkonian military vessel
 Cardassian military freighter
 Klingon Bird-of-Prey

See also 
 Troop transport

Spacecraft classifications