 The use of ICBMs and SLBMs is not, therefore, a rational or credible response to provocations which, although serious, are still less than an immediate threat to national survival.For this reason, among others, I consider that the national security will continue to require the flexibility, responsiveness, and discrimination of manned strategic weapon systems throughout the range of cold, limited, and general war".LeMay's dislike for tactical aircraft and training backfired in the low-intensity conflict of Vietnam, where existing Air Force fighter aircraft and standard attack profiles proved incapable of carrying out sustained tactical bombing campaigns in the face of hostile North Vietnamese antiaircraft defenses.