Military events in history, from World War I to the present, are not needed in ancient times, such as Normandy landing, Berlin crisis, Black Hawk Down and so on

In the late 1950s, the United States secretly developed the Polaris ballistic missile nuclear submarine. This weapon can be hidden in the depths of the ocean and launch missiles at enemy strategic targets. The US military kept it a secret, but a toy manufacturer exposed the weapon.

1960 In April, Hyman Rykov vice admiral, who led the development of the world's first nuclear-powered submarine and was known as the "father of nuclear submarines", told the Joint Committee of the Senate and the House of Representatives of the National Assembly that a toy manufacturer had produced a model of the Polaris nuclear submarine. This model is so accurate that "a clever ship designer can tell people that he spent an hour on that model and got millions of dollars worth of information effortlessly". The instructions posted on the toy worth $2.98 read: "The ballistic missile nuclear submarine is another set of models made in strict accordance with the specifications of the official blueprint of the US Navy. The electric ship department of General Dynamics has generously provided us with a set of accurate information, and I would like to take this opportunity to express my heartfelt thanks to the department. Without the cooperation of the Ministry, it is impossible to make an absolutely accurate model. " This model has all the internal equipment of this submarine, including nuclear reactor, control room, crew room and two Polaris missiles. Every point of this model is the same as the real thing, and the ratio is 1∶300. Rickover said that he was "surprised" that this model could be put on the market, because "if I were Russian, I would be very grateful for the generosity of the United States" and obtained this information at a cost of $2.98. He believes that this model provides accurate data on the size of the deck equipped with the reactor and the number of sailors operating the submarine.

The fifth column: 1936 During the Spanish Civil War, Mora, the general of the rebel Franco, claimed that his four columns were really attacking the capital Madrid, and the fifth column was waiting for them in Madrid. By "the fifth column", he meant the spies who had infiltrated the revolutionary camp and hid in Madrid. Since then, the "fifth column" has become synonymous with spies, secret agents and imperialist spies engaged in subversive activities in other countries.

Pearl Harbor Incident: Pearl Harbor is located in the Hawaiian Islands and is an important naval base of the United States in the Pacific region. 19411On the morning of Sunday, February 7th, Japan's navy and air force carried out a well-planned surprise attack on Pearl Harbor. In a very short time, at a very small price, they destroyed and injured more than 260 American warships 18 and planes at one stroke, almost completely destroying the main force of the US Pacific Fleet. The next day, the United States declared war on Japan, and the Pacific War of World War II officially broke out.