Sorry Shifty...not the right answer. Good try though. This nation had a military unit in the battle. (Reference: Day of Infamy, by Walter Lord)
For Rich, yes you are correct in that respect. The Akagi, Kaga, Hiryu, and Soryu we sunk in the battle, while the Light Carriers Ryujo and Junyo attacked the Aluetians. The Shokaku and Zuikaku were damaged at Coral Sea, while the Shoho was sunk. The rest of the listed Japanese carriers were assigned to Yamamoto's Battleship and reserve groups.