Reservist (noun)

1. A person who is a member of a reserve military force and is available to be called up for active duty in an emergency.
2. A person who has completed military training but is not currently serving in the armed forces.

Origin:

Mid 19th century: from french réserviste, from réserver "to reserve".

Examples:

1. The reservist was called up to active duty during the war.
2. The reservist was trained as a medic and was an asset to the military during his deployment.
3. Many reservists have civilian jobs and serve in the military as a part-time commitment.
4. The reservist was proud to serve his country as a member of the military.
5. The reservist's commitment to the military and his country was unwavering.