Yeah your right I'm pretty sure that the 334th was an independent regiment. Here is what I do know: the 334th Engineers Special Service Regiment was activated on 20 May 1942 at Camp Claiborne, Louisana and shipped out aboard the U.S Westpoint on 1 Novemeber 1942. Shortly after a thanksgiving dinner aboard the Westpoint, soldiers were thrown from their bunks as the ship accelerated to max speed to avoid "a torpedo that missed the ship by a mere six feet". Later that day the ships loud speaker broke silence. Tokyo Rose began to announce that the US Westpoint had been sunk..... What a crock 
On 4 December 1942 the Regiment arrived in Iran. They worked under the Persian Gulf Command, mainly as a construction regiment that helped maintain and construct supply roads, vital to the Russian Front. The Regiment left Iran in January of 1945 and was assigned to the Continental Advance Sector from 1 March 1945 to 10 June 1945. During which time the Regiment recieved battle credit for the Rhineland and Central Europe Campaign. Following these battles the Regiment built a combination railroad / highway bridge over the the Rhine at Mannheim and Ludwigshafen..... thats what I have so far 
But it's a good start,
Brian