"LONG MAY IT WAVE," Fort McHenry National Monument. A park historian tells a group of wide-eyed school children how The Star Spangled Banner was composed during the War of 1812. He explains that Francis Scott Key, held aboard an enemy ship during the bombardment of Baltimore, was inspired to write it when, after a night of attack from the harbor, he discovered in the morning that "The Flag was still there."

LEARNING ABOUT VOLCANIC ACTIVITY, Hawaii National Park. A park naturalist, from a vantage point overlooking Kilauea Crater, explains volcanic activity to an interested group from the Kilauea Military Camp—a rest and recreation camp operated for the use of members of the Armed Forces in the Islands. The most active vent of Kilauea Volcano is its great crater, shown in the background. Sometimes it fills with a boiling lake of active lava. Mauna Loa, the other active volcano in the Kilauea section of the park on the Island of Hawaii, also erupts periodically, the intervals varying from a few months to 9 years. Its activity usually takes the form of great streams of lava gushing from cracks in its side and rolling down toward the sea. (Courtesy, M/Sgt Chester Fentriss.)

WORLD WAR II SOLDIERS AT MOUTH OF WAWONA TUNNEL, Yosemite National Park. Although the national parks stood still in construction, maintenance, and anything but the barest protection, the National Park Service welcomed some 8 million members of the Armed Forces during World War II. Here soldiers on convoy training stop at the mouth of the Wawona Tunnel and see Yosemite Valley, where they will bivouac, spread before them. During the war the Ahwahnee Hotel in Yosemite became a convalescent hospital for the Navy; and there was much cooperation with the military in secret installations for defense throughout the System. (Photograph by Ralph H. Anderson.)