Despite Irish neutrality during World War II, Ireland had more than 50,000 participants in the war through enlistment in the British armed forces. During the Cold War, Irish military policy, while ostensibly neutral, was biased towards NATO. During the Cuban Missile Crisis, Seán Lemass authorised the search of Cuban and Czechoslovak aircraft passing through Shannon and passed the information to the CIA. Ireland's air facilities were used by the United States military for the delivery of military personnel involved in the 2003 invasion of Iraq through Shannon Airport. The airport had previously been used for the invasion of Afghanistan in 2001, as well as the First Gulf War.