IN SAUDI ARABIA, Feb. 15— Half of the American B-52 bombing raids over Kuwait and southern Iraq are being flown from an airfield in western Saudi Arabia, a senior United States military official said today.

The mammoth bombers, which have wing spans longer than half the length of a football field, have been the main weapon for pounding dug-in Iraqi ground and armored forces with their 1,900-pound bombs. Flying in sets of three planes, the B-52’s have maintained round-the-clock bombings on Iraqi troops.

B-52’s are also being flown from air bases in England, Spain and the Indian Ocean atoll of Diego Garcia, but the aircraft stationed in Saudi Arabia can fly as many as three times as many missions as the planes based farther away, the official said.

The basing of the B-52’s during the Persian Gulf crisis has been a sensitive political issue, even after hostilities broke out on Jan. 17.

All the countries the United States approached for basing rights hesitated, presumably because of the image of the B-52 as a weapon of indiscriminate bombing based on its use in North Vietnam during the Vietnam War, a reputation the Air Force considers inaccurate and unfair.

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BELOW (Right): Okinawans protest US Military bases on their island.