The Glen-class is a class of naval tugboat

Tugboat

A tugboat is a boat that maneuvers vessels by pushing or towing them. Tugs move vessels that either should not move themselves, such as ships in a crowded harbor or a narrow canal,or those that cannot move by themselves, such as barges, disabled ships, or oil platforms. Tugboats are powerful for...

 operated by the Royal Canadian Navy

Royal Canadian Navy

The history of the Royal Canadian Navy goes back to 1910, when the naval force was created as the Naval Service of Canada and renamed a year later by King George V. The Royal Canadian Navy is one of the three environmental commands of the Canadian Forces...

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Ships

The five vessels are divided between the two fleets of the Royal Canadian Navy

Royal Canadian Navy

The history of the Royal Canadian Navy goes back to 1910, when the naval force was created as the Naval Service of Canada and renamed a year later by King George V. The Royal Canadian Navy is one of the three environmental commands of the Canadian Forces...

, with three assigned to Maritime Forces Atlantic

Maritime Forces Atlantic

In the Canadian Forces, Maritime Forces Atlantic is responsible for the fleet and operations of the Royal Canadian Navy in the Atlantic Ocean and Arctic Ocean. The Commander of MARLANT is a two-star Rear Admiral....

 and two assigned to Maritime Forces Pacific

Maritime Forces Pacific

In the Canadian Forces, Maritime Forces Pacific is responsible for the fleet and operations of the Royal Canadian Navy in the Pacific Ocean...

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Maritime Forces Pacific, CFB Esquimalt

CFB Esquimalt

Canadian Forces Base Esquimalt is Canada's Pacific Coast naval base and home port to Maritime Forces Pacific and Joint Task Force Pacific Headquarters....

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Maritime Forces Atlantic, CFB Halifax

CFB Halifax

Canadian Forces Base Halifax is Canada's east coast navy base and home port to the Atlantic fleet, known as Maritime Forces Atlantic....

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Other tugs

The Canadian Forces operates six other smaller tugboats, the 140-ton , and five 45-ton Ville class tugs

Ville class tugs

The Royal Canadian Navy operates five Ville-class harbour tugs.The five vessels are the CFAV Lawrenceville ,CFAV Parksville ,CFAV Listerville ,CFAV Merrickville andCFAV Marysville ....

. The smaller tugs are also split between both coasts.

While the Glen class tugs are equipped for firefighting, the Canadian Forces maintains a pair of dedicated Fire class fireboat

Fire class fireboat

The Royal Canadian Navy operates two Fire-class fireboats/Yard tractor tugs. The two vessels are the CFAV Firebrand and the CFAV Firebird ....

s, the 140-ton and the (YTR 561), one each in each port.
The crews of the fireboats are cross-trained and able to crew a Glen class vessel in emergencies.

The Royal Canadian Navy

Royal Canadian Navy

The history of the Royal Canadian Navy goes back to 1910, when the naval force was created as the Naval Service of Canada and renamed a year later by King George V. The Royal Canadian Navy is one of the three environmental commands of the Canadian Forces...

 operated a fleet of tugboats during World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

 which were also named the Glen class

Glen class tug (1943)

The Glen class tugs were a class of tugboats of the Royal Canadian Navy built during World War II. There were three designs of tug; two were of steel-hulled construction and the other was wooden-hulled. Of the 20 of the class built, 16 were of the steel-hulled type; 11 built by Russel Bros. of Owen...

. The vessels of the current Glen class are each named after one of the vessels of the earlier class. The vessels of the earlier class were sold off into civilian service, with the Glenevis still in civilian service as late as 2007.