No, the "Commando Kieffer" is the colloquial name in France for 5th & 6th Troops of N°4 (British) Commando, 1st Special Service Brigade. Although their official French designation is "
1er bataillon de Fusiliers Marins Commando".
They were 177 French Navy sailors and officers whom had underwent commando training in Scotland from 1942.
On D-Day, they were the only French troops to take an active part in the ground invasion. Landing with the 1st SSB, Lord Lovat (under whom they served) had ordered the other landing craft to slow down to let them have the honour to be the first to set foot on French soil. As such, they will also sustain the first commando casualties, among which was Lt. Hubert, the first French officer killed on D-Day, and who's name was therefore later (and to this day) given to the French Navy's most elite unit, the
Commando Hubert.
Their mission that day was to neutralize the a gun battery set under the Riva Bella casino in Ouistreham, an action made famous by the Longest Day, with one (if not the) first scene shot by helicopter in movie history:
As depicted in the movie, a first assault failed, so Kieffer himself raced back to the beach and came back with a tank.
By the end of the day, 25% of the commandos were casualties. They were supposed to stay ashore for 3-4 days, then pulled back, but soldiered on in Normandy for 78 days, at the end of which only 28 out of 177 men were still on their feet.
