 During her second line period, however, her tour of duty off Vietnam came to an abrupt end on 16 April when she was shifted north to the Sea of Japan.North Korean aircraft had shot down a Navy reconnaissance aircraft in the area, and "Ticonderoga" was called upon to beef up the forces assigned to the vicinity.However, the crisis abated, and "Ticonderoga" entered Subic Bay on 27 April for upkeep.