This circular slide rule describes the effects of a nuclear explosion on people. After World War II, scientists at the Los Alamos Scientific Laboratory prepared a report on forms of damage associated with the explosion of atomic bombs. These included physical damage, fire and heat, and nuclear ra

Laying the groundwork for the Chicano movement of the 1960s, organizations like the American G.I. Forum began advocating on behalf of Hispanic veterans who were denied the educational, health care, housing, and other rights guaranteed by the G.I. Bill. Often working in concert with the League of

During World War II, the U.S. military needed to find accurate ways to guide missiles to their targets. Harvard University psychologist B. F. Skinner suggested that a missile nose cone be supplied with three compartments, each with a window. A pigeon would be placed in each section, and trained t

The ENIAC was a large, general-purpose digital computer built to compute ballistics tables for U.S. Army artillery during World War II. Occupying a room 30 feet by 50 feet, ENIAC—the Electrical Numerical Integrator and Computer—weighed 30 tons and used some 18,000 vacuum tubes. It could compu

Photographs can be powerful connections to the past. Soldiers, for example often had their portraits made before going off to war so that loved ones would have a rememberance of them in the event they did not return. This decorative mat is unusual and suggests the pride the owner may have felt ab

The Global Positioning System (GPS) consists of NAVSTAR satellites in earth orbit that send signals to receivers on land, sea, or in the air. The system became operational in 1978. Its military usefulness was demonstrated during Operation Desert Storm (1991), when coalition troops with receivers

This lithograph illustrates the chaos and conflict engulfing northern Mexico during the years of the Mexican-American War from 1846-1848. In these years the United States organized an Army of Occupation, initially led by General Zachary Taylor, to capture cities like Monterrey in preparation for

On a Sunday morning in December 1941, a chaplain had his most difficult assignment — to say a prayer to sailors aboard a U.S. navy ship actively under low–flying attack by the enemy firing from all directions. He quickly realized the best he could do was walk the ammunition line saying, “Pr

This print shows American forces attacking the fortress palace of Chapultepec on Sept. 13th, 1847. General Winfield Scott, depicted in the lower left on a white horse, led the southern division of the U.S. Army that successfully captured Mexico City during the Mexican American War.

During World War I, machine guns were heavy, crew-served weapons. Their operation required several soldiers. Even so-called light machine guns could not easily be handled by single soldiers. To meet the need for an individual rapid-fire weapon, several inventors devised submachine guns. Light eno