In 1922 the US Navy commissioned its first small experimental aircraft carrier. This was followed into service by two much larger and capable carriers in 1927 with five more being built prior to the Japanese attack on Pearl Harbor including three large Yorktown class. To take the offensive against the Japanese Navy, the American Congress funded by far the largest carrier building programme in history based on the Essex class, a larger version of the pre-war Yorktown vessels. Of the twenty-six o