Each state organizes and controls its own militia, and the national government has no control over it until it has been called into the service of the United States, when it becomes subject to the rules and discipline prescribed for the government of the regular army. In 1795, Congress passed an act prescribing the conditions under which the militia might be called into the service of the United States. This act conferred on the President of the United States the power to call out the militia whenever, in his judgment, it was necessary or expedient. Such calls are addressed to the governors of the states, who are the commanders of their several portions of the militia. When, however, the militia has been mustered into the service of the United States the President becomes their commander in chief. In pursuance of this authority the President has called out the militia on two different occasions; during the War of 1812 to repel invasion; and during the Civil War to suppress insurrection. In 1898 when the war with Spain was declared, the call was issued not for the militia but for volunteers.[53] Nevertheless many of the volunteers who responded were as a matter of fact members of the organized militia of their respective states. In pursuance of authority conferred by Congress in 1916, the President drafted the organized militia into the federal service in that year for service on the Mexican border, and again in 1917 on account of the war with Germany. [53] This was due to the fact that there was doubt as to whether the militia could be called out and sent abroad for the purpose of prosecuting a war against a foreign country, in view of the specification in the Constitution of the objects for which the militia may be called into the service of the United States. Under the Act of 1916, the organized militia may be drafted into the service of the United States for use anywhere if Congress declares that an emergency exists. They were so drafted in 1917 and sent to Europe, not as militia, but as a part of the regular army. _The Naval Militia._--In a number of the seaboard states and some of those bordering on the Great Lakes, there are organized bodies of naval militia, with training ships loaned by the United States for the purpose of drill and instruction. Like the land militia, the naval militia of each state is under the control of the state and until called into the federal service is under the command of the governor.[54] [54] According to the report of the secretary of the navy for 1916, the naval militia of the states numbered 9,170 men and 636 officers.