Lexington’s task force sortied from Pearl Harbor 15 April, rejoining TF 17 on 1 May. As Japanese fleet concentrations threatening the Coral Sea were observed, ''Lexington'' and ''Yorktown'' moved into the sea to search for the enemy’s force covering a projected troop movement; the Japanese must now be blocked in their southward expansion, or sea communication with [[Australia]] and [[New Zealand]] would be cut, and the dominions threatened with invasion. | Lexington’s task force sortied from Pearl Harbor 15 April, rejoining TF 17 on 1 May. As Japanese fleet concentrations threatening the Coral Sea were observed, ''Lexington'' and ''Yorktown'' moved into the sea to search for the enemy’s force covering a projected troop movement; the Japanese must now be blocked in their southward expansion, or sea communication with [[Australia]] and [[New Zealand]] would be cut, and the dominions threatened with invasion. |