AC5 (army corps)

AC5 is a NATO military abbreviation that stands for army corps. The NATO glossary of acronyms and abbreviations lists the entry as "AC5, army corps" and gives the French equivalent as corps d'armée. An army corps is a major army formation, and the abbreviation is part of the vocabulary NATO documents use to describe land forces.

The entry sits inside NATO's published terminology system. The glossary cites AAP-06 as the terminology reference for AC5, which ties the abbreviation to a controlled NATO source rather than to informal usage. Canadian suppliers who read defence or NATO-related documents will find AC5 defined in that source, as shown in the NATO glossary of acronyms and abbreviations.

What the AC5 entry says in the NATO glossary

The glossary entry is short and specific. It gives three pieces of information:

• The abbreviation: AC5.
• The English expansion: army corps.
• The French equivalent: corps d'armée.

The bilingual format matters because NATO publishes its terminology in English and French, the same two official languages used across the Government of Canada. The glossary pairs each English expansion with its French counterpart, so a bid team can match the two when a document uses either form.

AAP-06 and NATOTerm as the reference points

The glossary names AAP-06 as the reference behind the AC5 entry. For wider terminology checks, NATO maintains NATOTerm, its official database of non-classified military and NATO-relevant terminology. NATOTerm is run by the NATO Terminology Office, which is part of the NATO Standardization Office. The database is available through the NATOTerm portal.

When a document uses a NATO abbreviation you do not recognize, these two sources are the place to confirm it. The glossary settles what AC5 means, and NATOTerm is the broader database for related military terms.

AC5 is not Article 5

The characters "AC5" are easy to confuse with Article 5, the NATO collective defence commitment. They are unrelated. In the NATO glossary, AC5 is the abbreviation for army corps. Article 5 is a separate subject, explained on NATO's page on collective defence and Article 5. Bid teams that search for AC5 in tender documents or reference material should not treat results about Article 5 as relevant to the term.

What AC5 means for a supplier bidding on Canadian contracts

AC5 is a terminology item, not a requirement, clause or deliverable that a supplier must meet. If the abbreviation appears in a solicitation or in NATO-related material, read it as army corps and check how the document uses it in context.

Defence and security opportunities are published through CanadaBuys. The Department of National Defence explains in its information for companies that suppliers can learn about opportunities and submit bids through Canada's government procurement service. CanadaBuys also carries tender notices from PSPC, other federal organizations, broader public-sector bodies and NATO, and its tender support page explains how to search them.

• Treat AC5 as the NATO abbreviation for army corps, with corps d'armée as the French form.
• Use the NATO glossary and NATOTerm to confirm meaning when it appears in source documents.
• Keep it separate from Article 5 when searching or reporting.
• Take bid obligations from the solicitation itself on CanadaBuys.