"In the councils of government, we must guard against the acquisition of unwarranted influence, whether sought or unsought, by the military-industrial complex. The potential for the disastrous rise of misplaced power exists and will persist." -- Dwight Eisenhower January 17th, 1961, Presidential Farewell Address

A full text can be found here. An audio version is available below. It's really worth reading the entire address. Eisenhower shows commendable foresight.