what is the technology behind this operation?
To supplement the preliminary offshore bombardment and aerial assaults, some of the landing craft were equipped with artillery and anti-tank guns to provide close supporting fire.With the expectation that fuel would be difficult or impossible to obtain on the continent, the Allies built a "Pipe-Line Under The Ocean" (PLUTO).
Operation Overlord
 To supplement the preliminary offshore bombardment and aerial assaults, some of the landing craft were equipped with artillery and anti-tank guns to provide close supporting fire. The Allies had decided not to immediately attack any of the heavily protected French ports and two artificial ports, called Mulberry harbours, were designed by COSSAC planners. Each assembly consisted of a floating outer breakwater, inner concrete caissons (called Phoenix breakwaters) and several floating piers. The Mulberry harbours were supplemented by blockship shelters (codenamed "Gooseberries"). With the expectation that fuel would be difficult or impossible to obtain on the continent, the Allies built a "Pipe-Line Under The Ocean" (PLUTO). 
what is american logistics in the normandy campaign? It played a key role in the success of Operation Overlord, the Allied invasion of northwest Europe during World War II that commenced on D-Day, 6 June 1944.
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Operation Overlord [SEP] Technology
With the expectation that fuel would be difficult or impossible to obtain on the continent, the Allies built a "Pipe-Line Under The Ocean" (PLUTO). Specially developed pipes in diameter were to be laid under the Channel from the Isle of Wight to Cherbourg by D-Day plus 18. Technical problems and the delay in capturing Cherbourg meant the pipeline was not operational until 22 September. A second line was laid from Dungeness to Boulogne in late October. The British military built a series of specialised tanks, nicknamed Hobart's Funnies, to deal with conditions expected during the Normandy campaign. Developed under the supervision of Major-General Percy Hobart, these were specially modified M4 Sherman and Churchill tanks.