A FRENCH MILITARY PLANE on a training mission crashed in a wooded area near Port-Sainte-Marie in south-central France Tuesday, killing three pilots and seriously injuring a fourth person. . . . POLISH PRESIDENT Lech Walesa left for the United States Tuesday on an eight-day official visit to sign a declaration on cooperation with Washington. . . . SNOW AND RAIN continued to pound the West early Tuesday, helping both the water-starved California reservoirs and the snow-starved slopes of Nevada. Showers also fell in the Northeast. . . . SCATTERED CLASHES between Sri Lankan government security forces and separatist Tamil rebels killed at least eight people during overnight fighting.