USS Lexington (CV-2), nicknamed "Lady Lex",was an early aircraft carrier built for the United States Navy. Lexington was briefly refitted in Pearl Harbor at the end of the month and rendezvoused with Yorktown in the Coral Sea in early May. A few days later the Japanese began Operation Mo, the invasion of Port Moresby, Papua New Guinea, and the two American carriers attempted to stop the invasion forces. They sank the light aircraft carrier Shōhō on 7 May during the Battle of the Coral Sea, but did not encounter the main Japanese force of the carriers Shōkaku and Zuikaku until the next day. Aircraft from Lexington and Yorktown succeeded in badly damaging Shōkaku, but the Japanese aircraft crippled Lexington. Vapors from leaking aviation gasoline tanks sparked a series of explosions and fires that could not be controlled, and Lexington had to be scuttled by an American destroyer during the evening of 8 May to prevent her capture.