OTD in 1975, the Stanley R. Mickelsen Safeguard Complex at Nekoma, North Dakota, became fully operational, defending Minuteman ICBMs at Minot AFB with 30 Spartan (armed with 5-Mt W71 warheads) and 70 Sprint (armed with 1-kt W66 enhanced radiation warheads) antiballistic missiles. Image
Less than two months later, word leaked that the Army planned to deactivate Safeguard, days after Congress had voted to immediately shut it down, citing its growing ineffectiveness against Soviet MIRVs. By January 1976, only the site’s phased-array radar remained operational. ImageImageImage
Republican Mark Andrews—North Dakota's lone representative—bravely voted for the shutdown: “Because this ABM site does not have defense capability in today’s technology, it does not make much sense for me to…argue for [it] just because the expenditure happens to be in my State.” Image
John Macfarlane, the 29-year-old mayor of Landgon—home to many of the site's ~1,500 workers and whose economy had come to depend on it—said the decision shattered his trust in the federal government. “There ain't nothin' gonna happen that'll straighten that out. That's gone.” Image
Safeguard ultimately cost about $33 billion (in today’s dollars), not including the unknown but considerable research, development. testing, and production costs for the 115 nuclear warheads manufactured by the Atomic Energy Commission for the Spartan and Sprint missiles. ImageImage

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More from @AtomicAnalyst

3 Oct
35 years ago today, 680 miles NE of Bermuda, the Soviet Yankee 1-class ballistic missile submarine K-219 was on patrol when seawater leaked into a missile tube, triggering an explosion of the missile's volatile liquid fuel that killed three sailors and crippled the submarine. ImageImageImageImage
Under very dangerous conditions, the crew managed to shut down the submarine's reactors and stabilize it. Captain Igor Britanov was ordered to have the K-219 towed by freighter 4,300 miles to its homeport of Gadzhiyevo (near Murmansk), but it flooded and sank three days later. Image
The K-219's two reactors, 16 SLBMs, and 32-48 warheads sank 18,000 feet to the bottom of the Hatteras Abyssal Plain. In 1988, the Soviet research ship Keldysh found the sub upright but broken in two. Several missile hatches were open and the missiles and warheads were missing. Image
Read 8 tweets
27 Sep
30 years ago tonight, Pres. George H.W. Bush ordered the unilateral elimination of all land-based US nuclear weapons in Europe and S. Korea, all naval tactical nuclear weapons, the end of ground alert for all bombers, and the immediate de-alerting of all 450 Minuteman II ICBMs.
This sweeping move—which was fully supported by US military leaders—was unprecedented and came as a complete surprise to almost everyone. “America must lead again as it always has, as only it can,” said President Bush. Here's why he announced these dramatic changes when he did:
And here’s what those momentous orders looked like as transmitted to Strategic Air Command:
Read 6 tweets
26 Sep
Just past midnight today in 1983, thanks to “a funny feeling in my gut,” 44 year-old Lt. Col. Stanislav Petrov’s calm assessment that a satellite warning of the launch of five US Minuteman ICBMs was a false alarm likely averted a catastrophic nuclear war. washingtonpost.com/wp-srv/inatl/l…
Petrov's story—including his treatment by Soviet military authorities after this incident (which was hushed up for 15 years until his superior officer published a memoir)—is told in the 2014 hybrid documentary-drama “The Man Who Saved the World.”
Petrov died in May 2017 in Moscow of hypostatic pneumonia. He was 77. nytimes.com/2017/09/18/wor…
Read 4 tweets
17 Sep
Today in 1955, a specially-modified B-36 bomber—the NB-36H—made its first test flight out of Carswell AFB, Texas, carrying (but not powered by) an operational 1-Megawatt air-cooled nuclear reactor. It would make 46 additional flights over Texas and New Mexico through March 1957.
The NB-36H flew directly over Lake Worth, the principal water source for Fort Worth. A B-50 carrying specially-trained paratroopers escorted each test flight. Had the NB-36H crashed, they would jump into the impact zone to prevent any unauthorized entry.
A 12-ton lead-and-rubber-shielded cockpit with windows 10-12 inches thick protected the flight crew from the otherwise lethal amount of radiation emanating from the reactor hanging in the bomb bay. Special water pockets installed aft of the cockpit also absorbed radiation.
Read 16 tweets
16 Sep
This memorable episode aired less than two months after President John F. Kennedy—in a nationally-televised speech as the Berlin crisis rapidly escalated—urged Americans to start making plans for fallout shelters to save themselves and their families in case of a nuclear attack.
Almost overnight, Kennedy's address set off a nationwide fallout shelter frenzy. Heated debates ensued on the morality of turning away or even shooting neighbors trying to enter a family shelter in an emergency. Here's an article in TIME from August 18, 1961: “Gun Thy Neighbor?”
Harshly criticized (incl. by Eleanor Roosevelt and the Rev. Billy Graham) for triggering the hysteria, JFK subsequently pleaded, “Let us concentrate more on keeping enemy bombers and missiles away from our shores and concentrate less on keeping neighbors away from our shelters.”
Read 5 tweets
15 Sep
Tonight in 1980 at Grand Forks AFB, North Dakota, the number five engine on the right wing of a B-52H on ground alert caught fire during a drill. The aircraft was loaded with 8 Short-Range Attack Missiles (armed with 170-200-kt W69 warheads) and 4 B28 bombs (70 kt to 1.45 Mt).
That night, a southeast wind gusted up to 35 mph. The B-52 pointed in that direction. That alone kept the flames away from the fuselage. Had the nose been facing west, the fire would have incinerated all six crew members as they evacuated and burned the weapons in the bomb bay.
Because the crew did not follow the correct procedure to shut off the fuel lines before evacuating, the fire burned for three hours. Eventually, a crew member broke through the fire line, climbed into the B-52, and properly engaged the shutoff valves, extinguishing the blaze.
Read 12 tweets

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