The 2008 CIA World Factbook

by United States. Central Intelligence Agency

Aruba
defense is the responsibility of the Kingdom of the Netherlands

Ashmore and Cartier Islands
defense is the responsibility of
Australia; periodic visits by the Royal Australian Navy and Royal
Australian Air Force

Barbados
the Royal Barbados Defense Force includes a land-based
Troop Command and a small Coast Guard; the primary role of the land
element is to defend the island against external aggression; the
Command consists of a single, part-time battalion with a small
regular cadre that is deployed throughout the island; it
increasingly supports the police in patrolling the coastline to
prevent smuggling and other illicit activities (2007)

Bermuda
defense is the responsibility of the UK

Bouvet Island
defense is the responsibility of Norway

British Indian Ocean Territory
defense is the responsibility of the
UK; the US lease on Diego Garcia expires in 2016

British Virgin Islands
defense is the responsibility of the UK

Cayman Islands
defense is the responsibility of the UK

Christmas Island
defense is the responsibility of Australia

Clipperton Island
defense is the responsibility of France