1) Army extra 2) Soldier 1) Weekend warrior 
Every conscript which has served at least a day in the Bundeswehr is a reservist, unless he is declared ineligible for military service or has made a claim of conscientious objection. Soldiers of enlisted ranks with a limited contract (either 4, 8 or 12 years) or professional soldiers, who have filled their tour of duty, are likewise part of the r...
• (n.) A member of a reserve force of soldiers or militia.
Re·serv'ist noun A member of a reserve force of soldiers or militia. [ Eng.] 
[n] - a member of a military reserve
noun a member of a military reserve