In 1956, Keyhoe cofounded the National Investigations Committee on Aerial Phenomena (NICAP). He was one of several prominent professional, military or scientific figures on the board of directors, which lent the group a degree of legitimacy many of the other contemporary "flying saucer clubs" sorely lacked. NICAP published a newsletter, "The UFO Investigator", which was mailed to its members. Although the newsletter was intended to be published on a regular monthly basis, due to financial problems it was often delivered on a more erratic basis. For example, in 1958 four issues were published, but only two issues were published in 1959.