According to the Conscription Act, every Finnish male citizen is liable for military service from the beginning of the year in which he turns 18 years of age, until the end of the year in which he turns 60. Fulfilment of military service includes service as a conscript, participation in reservist training, extra service, and service during mobilisation, in addition to participation in call-ups and examinations assessing fitness for military service. According to the Act on Voluntary Military Service for Women, a woman can be accepted, upon application, for voluntary military service corresponding to conscript service.
The number of those interrupting military service includes conscripts who have opted for unarmed service or whose service has been interrupted due to a change in the fitness for service status. It also includes women who have announced within 45 days of the date of entering service that they will not continue in service.