Demobilization
Demobilization or demobilisation (see spelling differences) is the process of standing down a nation's armed forces from combat-ready status. This may be as a result of victory in war, or because a crisis has been peacefully resolved and military force is no longer necessary. The opposite of demobilization is mobilization, which is the act of calling up forces for active military service. Forceful demobilization of a defeated enemy is called demilitarization.
The United Nations defines demobilization as "a multifaceted process that officially certifies an individual's change of status from being a member of a military grouping of some kind to being a civilian". Persons undergoing demobilization are removed from the command and control of their armed force and group and the transformation from a military mindset to that of a civilian begins. Although combatants become civilians when they acquire their official discharge documents the mental connection and formal ties to their military command structure still exist. To prevent soldiers from rejoining their armed groups, important preparatory work must be done to ensure that combatants are ready to be reintegrated into society and capable of returning to their civilian lives. Civilians play an important role in supporting combatants to return to civilian life by exposing them to civilian lifestyles and mindsets that combat the rigid military mindset soldiers acquire during their time of service.
Demobilization can be partial or complete depending on the number of units removed from the command structure. The process is often a symbolic and significant part of the peace process during which the conflicting sides acknowledge their intent to consolidate peace.
The United Nations identifies demobilization as part of a three-pronged approach to conflict management. This includes disarmament, demobilization, and reintegration to take combatants out of conflict situations as well as remove weapons and help former members of armed groups rejoin society.
In the final days of World War II, for example, the United States Armed Forces developed a demobilization plan which would discharge soldiers on the basis of a point system that favored length and certain types of service. The British armed forces were demobilized according to an "age-and-service" scheme.The phrase demob happy refers to demobilization and is broadly applied to the feeling of relief at imminent release from a time-serving burden, such as a career. In the Russian language, it is known as dembel and has become a certain tradition in the Soviet and post-Soviet Armed Forces.  A United States equivalent is "short-timer's disease", comparable to "senioritis" among United States high school students.

Two approaches to demobilization
The United Nations Peacekeeping Operational Manual lists two different approaches to demobilization. These approaches are the semi-permanent demobilization sites (cantonment) or the mobile method which means demobilization at the sites where ex-combatants are gathered.

Other uses
In professional diving, demobilization is the dismantling, packing and transport back to storage of the diving spread, and where relevant, restoring the site to initial condition. Mobilization is the converse process.

See also
19th of April Movement
Demobilization of United States armed forces after World War II
World War 2 UK Demobilization Centres
Demob suit
Disarmament, demobilization and reintegration
Military discharge

References
Further reading
E McGaughey, 'Will Robots Automate Your Job Away? Full Employment, Basic Income, and Economic Democracy' (2018) SSRN, part 3(2)