ASSU (Air support signals unit)

ASSU stands for air support signals unit. It is a military communications term for a signals unit that carried the messages needed to request and coordinate air support for land forces. NATO lists the term in its glossary of abbreviations, and Library and Archives Canada lists it among the military abbreviations found in service files.

In Canadian historical sources, ASSUs were Army signals units. They maintained communications between forward formations, army headquarters and supporting air formations, so that requests for air support could be transmitted and acted upon. The term is a unit designation, and it describes a function: moving air support requests quickly from the front line to the people who could answer them.

How NATO records the term

The NATO glossary of acronyms and abbreviations (AAP-15) lists ASSU as "air support signals unit." It gives the French equivalent as "unité de transmissions d'appui aérien." Canadian bid teams working in both official languages can use these two forms when they need a consistent English and French rendering. The glossary entry is available in the NATO AAP-15 glossary.

What Canadian historical sources say an ASSU did

Several Canadian publications describe the role in similar terms.

• A Canadian archival study describes ASSUs as Army units from the Royal Corps of Signals that provided communications links for air support coordination. See the study held by Library and Archives Canada.
• A Department of National Defence historical publication states that ASSU communications connected forward links with army and air staffs and supported decentralized control of army air support. See the DND historical publication.
• A Canadian military history publication describes ASSUs as communicating frontline requests to supporting air formations. See The Crucible of War, 1939-1945.

Taken together, these sources place the ASSU as the communications link in the air support chain. It did not command air operations. It carried the traffic that allowed army and air staffs to work together.

Related Canadian abbreviations: CASSU and CASSURCCS

Library and Archives Canada lists ASSU as "Air Support Signal Unit" in its guide to military abbreviations used in service files. The same guide lists two related forms. CASSU means Canadian Air Support Signal Unit. CASSURCCS means Canadian Air Support Signal Unit, Royal Canadian Corps of Signals. Anyone reading Canadian service records or unit histories may see all three forms, and they refer to the same type of unit. The guide is published on the Library and Archives Canada military abbreviations page.

What ASSU means for a supplier bidding on Canadian public contracts

ASSU identifies a type of military signals unit. It does not by itself set a deliverable, certification, security clearance or equipment requirement for a supplier. If the term appears in a solicitation, in a statement of work or in supporting reference material, read the definitions and requirements written in that document and treat them as the authority. Where a bid involves bilingual material, the NATO English and French forms above give a consistent way to render the term. Suppliers who need clarification on how a buyer is using any military abbreviation should raise it through the question process stated in the solicitation.