Adele wrote the Operators Manual for the ENIAC after the 6 women (Kay McNulty, Betty Jean Jennings(Jean Bartik), Betty Snyder, Marlyn Wescoff, Fran Bilas and Ruth Lichterman) trained themselves to program the ENIAC using its logical and electrical block diagram.
Classified as "subprofessionals", Holberton, along with Kay McNulty, Marlyn Wescoff, Ruth Lichterman, Betty Jean Jennings, and Fran Bilas, programmed the ENIAC to perform calculations for ballistics trajectories electronically for the Ballistic Research Laboratory (BRL), US Army.
In 1945, one of these "computers", Kathleen McNulty (1921–2006), was selected to be one of the original programmers of the ENIAC, together with Frances Spence (1922– ), Betty Holberton (1917–2001), Marlyn Wescoff, Ruth Lichterman (1924–1986), and Betty Jean Jennings (1924–2011).