noun
active and first reserve duty
Military term referring to the combined obligation of active service and the initial reserve period.
彼は常備兵役を終えた後、予備役に編入された。
After completing his active and first reserve duty, he was transferred to the reserve forces.
兵役 is the general term for military service, while 常備兵役 specifies the active and first reserve component.
Compound of 常備 (standing, permanent) and 兵役 (military service).