To be eligible, a military member must have six or more years of active duty, and less than 20 years.
There are two types of pay: (1) Full Pay and (2) Half Pay.
To qualify for full pay, the member must be involuntarily separated, be fully qualified for retention and the service must be characterized as "Honorable." Examples would be separation due to reduction in force, or separation due to exceeding the high year of tenure.
To qualify for half pay, the member must be involuntarily separated, with service characterized as Honorable or General (under honorable conditions), and the reason for discharge must be under certain categories. Examples would be discharge due to failing fitness/weight standards or involuntary discharge due to parenthood.