Marshall Islands Chosen for Tests Starting in May.Battlewagons Atom - Doomed - Famous . U. S. Vessels Among Them. . . .the U.S.S. Pennsylvania and the U.S.S. Arkansas. The Navy today took the wraps off its plans to test the atom bomb against seapower and Senator McMahon (D-Conn) said he thought the United Nations Security council members ought to witness the historic experiment. [Poughkeepsie Journal Thurs. 24 Jan 1946]