Military service is an important duty in many countries, and therefore, being eligible for military duty is a significant milestone for many young people. There are several synonyms that can be used to describe this state of eligibility, including fit for duty, qualified for service, eligible for enlistment, or meeting the requirements for military service. These terms all describe the same thing, which is the ability of an individual to meet the standards required to serve their country in a military capacity. Being eligible for military service requires meeting physical, mental, and other qualifications that vary depending on the specific country and service branch.