1) Ancient Roman title 
Evocatus (plural Evocati) was the Latin term for a soldier in the Roman army who had served out his time and obtained a discharge (missio) but had voluntarily enlisted again at the invitation of the consul or other commander. There always existed a considerable number of evocati in every army of importance, and when the general was a favorite amon...
Reenlisted veteran.
A re-enlisted veteran. A soldier who opted to continue his service in the army after he had been due to retire. Often this was rewarded with a promotion.