Honorable Discharge

A military discharge is given when a member of the armed forces is released from his or her obligation to serve. Each country's military has different types of discharge. They are generally based on whether the person completed their training and then fully and satisfactorily completed their term of service or not. Other types of discharge are based on factors like the quality of the person's service; whether their service had to be ended prematurely due to humanitarian or medical reasons; whether the person had been found to have drug or alcohol dependency issues and whether they were complying with treatment and counseling; or whether the person had demerits or punishments for infractions or were convicted of any crimes. These factors affect whether they will be asked or allowed to reenlist and whether they qualify for special benefits after their discharge.

There are several reasons why someone may be discharged from the military, including expiration of enlistment, disability, dependency, and hardship.

Members of the British Armed Forces are to complete their service obligations before they may be considered for discharge. Service personnel who attempt to leave before completing their length of service, without going through the appropriate channels, may be subject to criminal conviction.

At the end of service in the Regular Forces, personnel normally have a compulsory reserve liability. The length of this liability depends on the Service, rank and type of commission or engagement in which they entered and whether they are subject to the Reserve Forces Act 1980 or 1996.

Army officers and other ranks must be interviewed by at least one of the following:

Individuals in the Royal Navy and Royal Marines who are not due for compulsory retirement but who wish to leave the Service, for whatever reason, before reaching the end of their Commission/Career/Engagement may apply for Early Termination, provided the conditions outlined in Chapter 54 of BR 3 - Naval Personnel Management are met. Within the Naval Service, the term "retirement" applies to officers who complete the period of service required by their respective commissions. For officers of the trained strength, recommendations for termination of a commission must generally be reviewed by the Admiralty Board.

...
Wikipedia