The British Army is the land warfare branch of British Armed Forces in the United Kingdom. It came into being with the unification of the Kingdom of England and Scotland into the Kingdom of Great Britain in 1707. The new British Army incorporated Regiments that had already existed in England and Scotland and was administered by the War Office from London. It has been managed by the Ministry of Defence since 1964.

The full-time element of the British Army is referred to as the Regular Army since the creation of the reservist Territorial Force in 1908. The British Army is deployed in many of the world's war zones as part of both Expeditionary Forces and in United Nations Peacekeeping forces. The British Army is currently deployed in Kosovo, Cyprus, Germany, Afghanistan and many other places.

All members of the Army swear (or affirm) allegiance to the monarch as commander-in-chief. However the Bill of Rights of 1689 requires Parliamentary consent for the Crown to maintain a standing army in peacetime. Parliament therefore annually approves the continued existence of the Army.

The Rat Pack was a group of actors originally centered on Humphrey Bogart. In the mid-1960s it was the name used by the press and the general public to refer to a later variation of the group, after Bogart's death, that called itself "the summit" or "the clan," featuring Frank Sinatra, Dean Martin, Sammy Davis, Jr., Peter Lawford, and Joey Bishop, who appeared together on stage and in films in the early-1960s, including the movie Ocean's 11. Sinatra, Martin and Davis were regarded as the group's lead members.

The name "The Rat Pack" was first used to refer to a group of friends in New York. Several explanations have been offered for the famous name over the years. According to one version, the group's original "Den Mother," Lauren Bacall, after seeing her husband (Bogart) and his friends return from a night in Las Vegas, said words to the effect of "You look like a goddamn rat pack." "Rat Pack" may also be a shortened version of "Holmby Hills Rat Pack", a reference to the home of Humphrey Bogart and Lauren Bacall which served as a regular hangout.