Some players can choose to garrison infantry and/or artillery units on selected territories.
Garrison territories are Gibraltar and Malaya (but only get the defense bonus if attacked from sea zone), Malta*, and any originally controlled islands EXCEPT Borneo, Hawaii, Aleutians, Philippines, and Atlantic, Mediterranean*, Indian Ocean, and ANZAC islands.
Procedure: As a separate and distinct non-combat move, the player can choose to convert one (1) artillery or infantry unit to a garrison unit. This changes the unit to A0 D3 M0. The change is permanent. They can be transported in a non-combat move and can occupy a fortification.