Glider, you're wrong on many of your points:
1.) The Enigma wasn't completely broken in 42 43, infact there was a period were it was fully kryptic.
2.) The men could easily be transported by U-boat, the Germans set off spies in the US quite a few times, not to mention a multitude of weatherstations etc etc. And a Type IXD could carry tons of equipment and men, easily carrying about 25 men beyond the crew
3.) When they arrive they can commandeer a vehicle if needed.
4.) Civilian clothes is brought along to give the ability to blend in when needed.
5.) Spies could be set off long BEFORE the raid, gathering information beneficial to the succes of the raid.
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Guys,
Here is a possible hypothetical scenario:
In early 1942 the planning of the raid has been completed, and it goes as follows:
3 weeks prior to the commando attack automated weatherstations radiotransmitters are set up on the coasts closest to the target areas by U-boats. During the following weeks intel is gathered on the weather conditions and the various US radio stations are monitored as-well as any radio communication in the area.
The purpose of this is to make sure that beyond the weather being good at the time of the landing, and perhas knowing about certain events taking place in the area, it is also made sure that no'one has gotten hint of anything, perhaps discovering one of the weather radio stations, in which case the operation can be called off.
To further safe guard against the cover being blown German spies are set off a week before the raid, there mission being to gather intel much the same way as the radio weather stations while at the same time making sure they aren't uncovered. The spies will also gather the crucial information on the landscape terrain of the target area, having ready detailed maps at the arrival of the commandos. The spies can also acquire transportation to the commandos as they land, picking them up in a purchased truck or truck(s).
Now as to the goal of the operation itself, well let's say 25 commandos are dropped off at each landing zone (During the night ofcourse). Now after having landed and reached the target area time has pretty much run out to carry out any further tasks that day, therefore the men will plan then rest until next nightfall.
Now as to the attack itself, well we can think about that but there are few possible things they could do:
They could sneak in at night, place some explosives, and heck perhaps even break into a bank, acquiring valuables. While that is done another team would bust the local police station, taking out the personnel (Or taking them hostage). All the while five other men are cutting telephone lines as well as electricity to the town. If this was done to a town it would be helpless until the next day.
However remember no'one is suggesting any of this will be a walk in the park, many things could go wrong, and it often only takes one thing to go wrong for the rest to follow suit. So if the mission is to have any chance of success it is crucial that all details regarding the operation stay secret right up till the night of the landing itself. Regardless to say the right planning coupled with highly skilled spies commandos are absolutely essential to the success of the operation.
Now as for all of you who are skeptical, think for a moment, how would you carry out a similar operation, remember there is always some way to do it.