Mass Effect & Mass Effect 2
The asari military resembles a collection of tribal warrior bands with no national structure. Each community organizes its own unit as the locals see fit, and elect a leader to command them. Units from populous cities are large and well-equipped, while those from farm villages may be only a few women wit small arms. There is no uniform; everyone wears what they like. The asari military is not an irregular militia, however; those who serve are full-time professionals.
The average asari huntress is in the maiden stage of her life and has devoted 20-30 years to studying the martial arts. Asari choose to be warriors at a young age, and their education from that point is dedicated to sharpening the mind and body for that sole purpose. When they retire, they possess an alarming proficiency for killing.
Huntresses fight individually or in pairs, depending on the tactics preferred in their town. One-on-one, a huntress is practically unbeatable, possessing profound tactical insight, a hunter's eye, and a dancer's grace and alacrity. Biotics are common enough that some capability is a requirement to be trained as a huntress; lack of biotic talent excludes a young asari from military service.
While fluid and mobile, asari can't stand up in a firestorm the way a krogan, turian, or human could. Since their units are small and typically lack heavy armor and support weapons, they are almost incapable of fighting a conventional war, particularly one of a defensive nature. So asari units typically undertake special operations missions. Like an army of ninja, they are adept at ambush, infiltration, and assassination, demoralizing and defeating their enemies through intense, focused guerilla strikes.
As a popular turian saying puts it, 'The asari are the finest warriors in the galaxy. Fortunately, there are not many of them.'