45 Commando Royal Marines is a battalion

Battalion

A battalion is a military unit of around 300–1,200 soldiers usually consisting of between two and seven companies and typically commanded by either a Lieutenant Colonel or a Colonel...

 sized unit of the British Royal Marines

Royal Marines

The Corps of Her Majesty's Royal Marines, commonly just referred to as the Royal Marines , are the marine corps and amphibious infantry of the United Kingdom and, along with the Royal Navy and Royal Fleet Auxiliary, form the Naval Service...

 and subordinate unit within 3 Commando Brigade

3 Commando Brigade

3 Commando Brigade is a commando formation of the British Armed Forces and the main manoeuvre formation of the Royal Marines. Its personnel are predominantly Royal Marines, supported by units of Royal Engineers, Royal Artillery, The Rifles, and the Fleet Air Arm, together with other Commando...

 Royal Marines, the principal Commando

Commando

In English, the term commando means a specific kind of individual soldier or military unit. In contemporary usage, commando usually means elite light infantry and/or special operations forces units, specializing in amphibious landings, parachuting, rappelling and similar techniques, to conduct and...

 formation, under the Operational Command of Commander in Chief Fleet.

Tasked as a Commando amphibious

Amphibious warfare

Amphibious warfare is the use of naval firepower, logistics and strategy to project military power ashore. In previous eras it stood as the primary method of delivering troops to non-contiguous enemy-held terrain...

 unit, 45 Cdo RM is capable of a wide range of operational tasks. Based at RM Condor

RM Condor

RM Condor is a large Royal Marines base located near Arbroath in East Angus, Scotland. The base has been home to 45 Commando, which is part of 3 Commando Brigade, since 1971, although it was first constructed as a Fleet Air Arm base in 1938, when it was known as HMS Condor...

, their barracks in Arbroath

Arbroath

Arbroath or Aberbrothock is a former royal burgh and the largest town in the council area of Angus in Scotland, and has a population of 22,785...

, personnel regularly deploy outside the United Kingdom on operations or training.