18th October 1941 saw a Reconnaissance Battalion train in Co. Armagh while two years later, another contingent of U.S. Forces landed at the docks in Belfast.
On 18th October 1941, 5th Reconnaissance Battalion took part in a motorised training exercise in the countryside around the Castledillon Estate in Co. Armagh.
On 18th October 1943, a contingent of the United States Military arrived in Northern Ireland under the command of Major General Walter Melville Robertson.