Draper Lab is a private, nonprofit R&D lab, spun out of MIT's Instrumentation Lab in 1973 - amid protests from students about the school's deep involvement in military work. The Instrumentation Lab employed as many as 2,000 people at its peak, developing guidance systems for missiles used in Vietnam, as well as in aircraft and the Apollo program. Charles Stark Draper was director of the Instrumentation Lab, and president of the Draper Lab for two years before retiring. Draper (who spent twelve years as a graduate student at MIT), and his students developed gyroscopic inertial navigation technologies after the war, which revolutionized aeronautics and made nuclear missiles possible. The lab now employs around 750 people and the majority of the lab's work is still in developing guidance systems for military applications.