Reegor
Airman 1st Class
Zipper SAC was constantly innovating and changing. For one thing it was and is well known that "settled" tactics don't work mostly due to the ability of our potential enemies to observe and prepare counters. Secondly technology, especially military technology, does not stand still. As new technologies develop including ECM, Radar and Guidance, stand off weapons systems like cruise missiles and on and on, tactics needed to be adjusted or entirely scrapped. And they were. SAC was an organic beastie that grew and changed frequently. It's ineffective use was not inherent in SAC but rather the political bosses that dictated uses.
I researched this recently for a book. My conclusions FWIW was that SAC was very innovative, but it was all centralized. (in the 50s) In the VN war, the SAC generals were promoted to run the entire USAF, and they continued with their centralized command style in managing the USAF fighter pilots who were the ones bombing N. Vietnam. This caused considerable friction and complaints, increased casualties, and reduced effectiveness. (Senior leadership did not agree, which is why they kept doing it.)
Even during the B-52 Christmas (?) bombings, there were complaints from the B-52 crews that poor tactics were being forced on them from Omaha, such as all AC ingressing and exiting the target on the same vectors. See Flying from the Black Hole: The B-52 Navigator-Bombardiers of Vietnam for this analysis.