Tirocinium

(Latin) the first military experience of a young man; during this period, the new soldier would have to train; period of recruitment training.
Found on http://ablemedia.com/ctcweb/glossary/glossaryi.html

tirocinium

The first campaign of a recruit.
Found on http://www.encyclo.co.uk/visitor-contributions.php

Tirocinium

Recruit's first campaign.
Found on http://www.encyclo.co.uk/local/20764

tirocinium

early training; first experience; group of recruits
Found on http://phrontistery.info/t.html
No exact match found