Second-in-Command
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For the film, see Second in Command.

A labeled image of a Parade Commander, Parade Second-in-command, and Squad Commander.

The Second-in-Command (2i/c or 2IC) is the deputy commander of any British Army or Royal Marines unit, from battalion or regiment downwards. He or she is thus the equivalent of an Executive Officer in the United States Army. This terminology is also used in many other Commonwealth armies.

The Second-in-Command of a battalion or regiment is usually a Major. The Second-in-Command of a company, squadron or artillery battery (in which he or she is called the Battery Captain) is usually a Captain (although infantry company Second-in-Commands were usually Lieutenants until after the Second World War), the Second-in-Command of a platoon or troop is the Platoon or Troop Sergeant, and the Second-in-Command of a section is usually a Lance Corporal.

In the Royal Navy the second-in-command of a vessel is known as the First Lieutenant or Executive Officer.

Other meanings/uses

Less formally, "second-in-command" is a term used, usually unofficially and sometimes jocularly, for any deputy. Its basic meaning is "someone who relieves a commander".