QUES: In Article 3 of the Treaty of San Francisco between the Allied Powers and Japan, which came into force in April 1952, the U.S. put the outlying islands of the Ryukyus, including the island of Okinawahome to over 1 million Okinawans related to the Japaneseand the Bonin Islands, the Volcano Islands, and Iwo Jima into U.S. trusteeship. All these trusteeships were slowly returned to Japanese rule. Okinawa was returned on May 15, 1972, but the U.S. stations troops in the island's bases as a defense for Japan.
Why did the US have troops on Okinawa?

ANS: as a defense for Japan.

QUES: The maximum distance at which a gun or missile can engage an aircraft is an important figure. However, many different definitions are used but unless the same definition is used, performance of different guns or missiles cannot be compared. For AA guns only the ascending part of the trajectory can be usefully used. One term is 'ceiling', maximum ceiling being the height a projectile would reach if fired vertically, not practically useful in itself as few AA guns are able to fire vertically, and maximum fuse duration may be too short, but potentially useful as a standard to compare different weapons.
What is an important number when it comes to guns engaging an aircraft?

ANS: The maximum distance

QUES: Unlike the heavier guns, these smaller weapons are in widespread use due to their low cost and ability to quickly follow the target. Classic examples of autocannons and large caliber guns are the 40 mm autocannon and the 8.8 cm FlaK 18, 36 gun, both designed by Bofors of Sweden. Artillery weapons of this sort have for the most part been superseded by the effective surface-to-air missile systems that were introduced in the 1950s, although they were still retained by many nations. The development of surface-to-air missiles began in Nazi Germany during the late World War II with missiles such as the Wasserfall, though no working system was deployed before the war's end, and represented new attempts to increase effectiveness of the anti-aircraft systems faced with growing threat from [bomber]s. Land-based SAMs can be deployed from fixed installations or mobile launchers, either wheeled or tracked. The tracked vehicles are usually armoured vehicles specifically designed to carry SAMs.
Where were surface-to-air missiles first developed?

ANS: in Nazi Germany

QUES: Artists such as Gary Numan, the Human League, Soft Cell, John Foxx and Visage helped pioneer a new synthpop style that drew more heavily from electronic and synthesizer music and benefited from the rise of MTV. Post-punk artists such as Scritti Politti's Green Gartside and Josef K's Paul Haig, previously engaged in avant-garde practices, turned away from these approaches and pursued mainstream styles and commercial success. These new developments, in which post-punk artists attempted to bring subversive ideas into the pop mainstream, began to be categorized under the marketing term new pop.
How did pos-punk give rise to pop?

ANS:
post-punk artists attempted to bring subversive ideas into the pop mainstream