The war also brought many American Indians closer to the mainstream of American life. Some 25,000 served in the army (including the famous Navajo “code-talkers,” who transmitted messages in their complex native language, which the Japanese could not decipher). Insisting that the United States lacked the authority to draft Indian men into the army, the Iroquois issued their own declaration of war against the Axis powers. Tens of thousands of Indians left reservations for jobs in war industries. Exposed for the first time to urban life and industrial society, many chose not to return to the reservations after the war ended (indeed, the reservations did not share in wartime prosperity). Some Indian veterans took advantage of the GI Bill to attend college after the war, an opportunity that had been available to very few Indians previously.