This page from the manifest of the Richard J. Gatling shows 89(!) 'rocket planes'. I'm not 100% sure if the 'rocket planes' were in the ship's hold or just delivered to the docks at Cherbourg though, or even if this refers to the Me 163 or He 162. And 726 cubic feet is only around 9 feet long by 9 feet wide by 9 feet high, most odd.
