M-3PO military protocol droid
The M-3PO military protocol droid, also known as the standard military protocol unit, was a variant of Cybot Galactica's successful 3PO-series protocol droid, designed for military applications. These droids were common sights in planetary garrisons and starfighter bases.
Characteristics

Cybot Galactica's M-3PO military protocol droid were produced with a black-hued version of the standard 3PO-series humanoid body. Their sensor-filled, clamshell-shaped heads were appropriated from the discontinued KW traffic controller.
Despite their "military" designation, M-3PO units were not designed as battle droids. Rather, they were administrative organizers, programmed with the rules and regulations of over six million military and paramilitary organizations. M-3POs specialized in equipment requisitioning, barracks billeting, duty roster planning and personnel file management. These units were notoriously thorough, and insisted on maintaining procedure through the "proper channels".
Appearances

- Jedi Trial (First identified as standard military protocol unit)
- X-Wing: Rogue Squadron (First appearance)
- X-Wing: Rogue Squadron unabridged audiobook
- X-Wing: Wedge's Gamble
- X-Wing: The Krytos Trap
- X-Wing: The Bacta War
- X-Wing: Isard's Revenge
- I, Jedi
- The New Jedi Order: Dark Tide II: Ruin
- The New Jedi Order: Agents of Chaos II: Jedi Eclipse
Sources
- Standoffs
- Arms & Equipment Guide
- The Essential Guide to Droids
- Star Wars Adventure Journal 11
"Look Sir, Droids!"—Star Wars Gamer 3
- The Official Star Wars Fact File 32 (MAN3-4, Droid Manufacturers)
"Arms & Equipment Guide Extras!" (original article link) on Wizards.com (content now obsolete; backup link) (As "M-3PO Protocol Droid")
- Threats of the Galaxy
- The Complete Star Wars Encyclopedia
- Desperate Allies