What happened May 1957 AD

In May 1957, Diệm undertook a ten-day state visit to the United States. President Eisenhower pledged his continued support, and a parade was held in Diệm's honor in New York City. Although Diệm was publicly praised, Secretary of State John Foster Dulles conceded in private that Diệm had been selected because there were no better alternatives.

In early May two paratroopers were shot in the street by the FLN, their comrades led by one of Trinquier's informers attacked a bath-house which was believed to be an FLN hideout, killing almost 80 Muslims.

By 1957, Genovese felt strong enough to move against Luciano and his acting boss, Costello. He was aided in this move by Anastasia family underboss Carlo Gambino. On May 2, 1957, following Genovese's orders, Vincent "Chin" Gigante ambushed Costello in the lobby of his Central Park apartment building, The Majestic. Gigante called out, "This is for you, Frank," and as Costello turned, shot him in the head. After firing his weapon, Gigante quickly left, thinking he had killed Costello. However, the bullet had just grazed Costello's head and he was not seriously injured. Although Costello refused to cooperate with the police, Gigante was arrested for attempted murder. Gigante was acquitted at trial, thanking Costello in the courtroom after the verdict. Costello was allowed to retire after conceding control of what is called today the Genovese crime family to Genovese. Luciano was powerless to stop it.

In the years that followed, Eisenhower increased the number of U.S. military advisors in South Vietnam to 900 men. This was due to North Vietnam's support of "uprisings" in the south and concern the nation would fall. In May 1957 Diem, then President of South Vietnam made a state visit to the United States for ten days. President Eisenhower pledged his continued support, and a parade was held in Diem's honor in New York City. Although Diem was publicly praised, in private Secretary of State John Foster Dulles conceded that Diem had been selected because there were no better alternatives.

USS Skate (SSN-578), the third submarine of the United States Navy named for the skate, a type of ray, was the lead ship of the Skate class of nuclear submarines. She was the third nuclear submarine commissioned, the first to make a completely submerged trans-Atlantic crossing, and the second submarine to reach the North Pole and the first to surface there.

May 22, 1957: a 42,000-pound (19,000 kg) Mark-17 hydrogen bomb accidentally fell from a bomber near Albuquerque, New Mexico. The detonation of the device's conventional explosives destroyed it on impact and formed a crater 25 feet (7.6 m) in diameter on land owned by the University of New Mexico. According to a researcher at the Natural Resources Defense Council, it was one of the most powerful bombs made to date.