Grobstein

On May 10, 1940, British warships approached Reykjavík and anchored in the harbour.
The invasion of Iceland, codenamed Operation Fork, was a British military operation conducted by the Royal Navy, the Royal Marines and a Canadian task force.
To guard against a German counterattack by sea, the British secured Reykjavík harbour and sent troops over land to nearby Hvalfjörður.
On May 17, 1940, 4,000 British troops arrived to relieve the marines, and they were subsequently augmented, to a final force strength of 25,000.
Iin July 1941, American forces relieved the British a year later, launching Task Force 19 (TF 19) from Argentia, Newfoundland.
British and later American soldiers built bases in Reykjavík.
The U.S. Navy remained at Naval Air Station Keflavik until 2006.

British and later American soldiers built bases in Reykjavík.
By July, 1941, three crews and three sets of radar equipment arrived at Reykjavik, and British Army engineers had nearly completed erection of Nissen huts to house radar gear and accommodation at three sites, including one near Reykjavik.
Air operations in the North Atlantic were primarily anti-submarine and
meteorological; no fighter, bomber or transport squadrons of either RCAF or RAF were based there.
The work of RCAF Radar (Air) personnel was essentially that of maintaining radar
gear carried by RAF/RCAF Coastal squadrons flying Hudsons, Liberators and Consolidated Canso As.
RAF Squadron86 was based at Reykjavik.
RCAF Squadron162 (Bomber Reconnaissance) was based at Reykjavik.
The U.S. Navy remained at Naval Air Station Keflavik until 2006.