DEFCON 3, October 1973

SIOP//62 is a plan executed; Cuba is a ladder climbed; this is a posture held. Nobody came close to firing in October 1973, and that is the study's subject. The value of an alert with no war is that it shows the force as it actually stood: which bombers went to the pads, which boats sailed, how long each leg of the ladder took, and what the other side could see. The seventies force is the mature one, a thousand Minuteman silos, the first MIRVs, Poseidon replacing Polaris, and a Soviet ICBM force past numerical parity, and it was held under a plan, SIOP-4, that the government was three months from declaring too rigid to use. Nixon's NSDM-242 of January 1974 and Schlesinger's "limited nuclear options" were the answer; SIOP-5 followed in 1976. October 1973 is the last alert under the old doctrine and the case that made the new one.

The study has two halves and a second act.

• The posture. A DEFCON ladder as the readiness lab draws it, but from the record of one night: the WSAG meeting late on the 24th, the JCS message ordering DEFCON 3 worldwide, SAC's own steps, the 82nd Airborne and the carriers, the Sixth Fleet's movements, and the stand-down over the following days. Every step on the ladder is a documented message with a time.
• The plan behind it. RUN executes SIOP-4 with the forces the alert had generated, as the alert-force enactment does for 1961, against target categories rather than a transcribed list, because no seventies target list is in the record. The point of pressing it is the finding the seventies produced: assured destruction had no smaller option, which is why NSDM-242 was written.
• Second act, October 1969. Nixon's secret readiness test of 13 to 30 October 1969, the "madman" alert, with SAC bombers airborne over Alaska and the north Pacific for the first time since Chrome Dome ended. Same engine, no crisis, an alert as a signal; the contrast with 1973 is the decade's own story.

The night

The American force, October 1973

The Soviet force, October 1973

The seventies doctrine

• The ladder, drawn against the clock of one night: each message a step, each step with its time and its source, the readiness lab's option curve replaced by the DEFCON ladder as SAC and the fleet actually climbed it. Bombers move to the pads on the map; the carriers move on the Mediterranean; the 82nd stands to at Bragg. The Soviet side stays where it is, which is the finding.
• Pressing RUN: SIOP-4 with the generated force, allocated by the NUWEP categories as a stated rule, Soviet nuclear forces first. The Minuteman fields fire from six wings in the northern plains, the Soviet fields from the Volga to Transbaikal; the sum runs over the HYDE 1973 grid. The visible point is what assured destruction meant with seven thousand warheads and no smaller option, next to what SIOP//62 meant with three thousand.
• The 1969 act: the same ladder for the secret alert, with the airborne B-52s over Alaska and the north Pacific as tracks, and nothing on the other side of the map, because the alert's whole purpose was to be seen.

#/study/defcon3-73 plays the posture and #/study/defcon3-73/execute the plan behind it. The order of battle is built by scripts/build-order-of-battle-1973.py from the unit histories: 37 American and 32 Soviet strategic sites, positions geocoded from the modern map with the Soviet fields hand-set where the town is not the field. The ladder is data/defcon3/alert-1973.json, fifteen steps with a time and a source each, from Dobrynin's telephone call at 9:35 p.m. to the Sixth Fleet's stand-down on 17 November. The Guam recall and the carriers' orders are drawn as tracks from the Foreign Relations volume's memorandum for the record.

Execution. SIOP-4 is enacted by the NUWEP-74 categories as a rule, Soviet nuclear forces first with one weapon per silo, then the 1956 complexes standing in for the urban-industrial list; the Soviet force launches on warning twenty-five minutes after the first American launches, against the American silos and bomber bases and the 150 most populous cells of the 1973 grid by a stated rule, because no Soviet list is in the record either. Both sides hold back what has no target rather than being given invented ones.

On the 30-arc-second grid the Soviet blast-only sum passes the top of the OTA range, where the five-arc-minute grid had put it inside: the finer grid keeps a city's people in its core, under the rings, where the coarser one had spread them over nine-kilometre cells. The American sum falls far below the OTA figure on either grid, and the reason is on the readout: the Soviet strike here has 150 urban targets and holds back a third of its force, where the OTA case put the whole force on every urban area. That is the target list's poverty, not the model's, and the study says so rather than inventing the list.

What the execution shows. The missiles decide the first hour: the American ICBMs and Poseidons land from H+22 minutes and the Soviet launch on warning lands from H+44, so both silo fields are struck after they have emptied, which is the counterforce paradox of the decade drawn on the map. The generated bombers leave at three hours into a country already burning and arrive after nine. With 7,000 warheads against 2,200 the exchange is not symmetrical and the sums are not either.

The 1969 act. #/study/defcon3-73/1969 plays the secret readiness test on a clock of days from Wheeler's message of 10 October: the stand-downs and communications silence from the 13th, the naval movements the Soviet navy noticed in the Gulf of Aden, Kissinger's "signal-type activity" on the 17th, SAC's order of the 23rd, and Giant Lance from the 26th, eighteen nuclear-armed B-52s in three waves of six flying eighteen-hour vigils on the Eielson East orbit over Alaska, the 92nd Strategic Aerospace Wing named in the record and the California wing reconstructed. The Soviet side of the map is empty on purpose: the alert was designed to be seen, and the record has no sign it was read as intended. The sites are the 1973 order of battle with a note, since the Minuteman wings were the same and the rest differs in models more than places.

MIRVs. The Minuteman IIIs and Poseidons fly as buses: each missile carries its warheads on one arc until post-boost, then the reentry vehicles part for targets within 300 km of the first, which is the footprint rule the builder applies. A missile that fails takes every warhead with it. The American strike is 4,176 warheads on about 1,900 vehicles.

Timing artefact to note. The clock runs from the WSAG's convening; the JCS message time of 11:41 p.m. is Sagan's, while the memorandum for the record puts the DEFCON decision at the meeting's start. Both are on the readout.

• No seventies target list is in the record. Targeting is by the documented categories and says so on every mark; the 1956 list has no part here.
• The number of Minuteman IIIs, boats at sea and bombers on the pads on the night are reconstructions from year tables and deployment patterns, tiered as such, until the SAC and Navy histories for October 1973 give them.
• The Soviet strategic posture is documented as unchanged; the study does not draw a Soviet response it cannot source.
• Casualty estimates for a 1973 exchange exist in the record only as the assured-destruction planning figures; the readout gives the engine's sum and those figures side by side.

• The Minuteman and Titan wings with silo fields, the three Titan bases, and the B-52 and FB-111 bases of 1973, from the Databook and the modern map.
• The Soviet ICBM fields by location and type from the Databook volume 4 tables.
• The alert ladder as timed messages from EBB 98 and the SAC history.
• The carriers' positions on the 24th and 25th, from the Sixth Fleet records in EBB 98.
• HYDE 1973 and 1969, prepared under public/data/hyde/ as popc_1973 (world total 3.91 billion) and popc_1969 (3.61 billion); 1973 is committed with the study.