Peace Through Superior Firepower/Intercontinental Ballistic and Cruise Missiles

Intercontinental Ballistic Missiles
US ICBMs were under the SAC until 1992, then spent 17 years as part of Space Command before becoming part of the new Global Strike Command in August 2009.

These missiles remain on high alert, but aren't currently targeted on anything. This effectively means that they could launch with 15 minutes warning, which serves the US just fine.

SM-65 Atlas
The US's first successful ICBM.

Had a unique "1.5-stage" configuration; it jettisons two out of three engines during its ascent but keeps the fuel tanks and some other things. Was not silo-launched until the Atlas-F; they explored a variety of screwy basing schemes for their missile. Very quickly allowed the US to gain a massive advantage in strategic missiles over the Soviets; although the Soviets had the first ICBM, the R-7, it was much better suited for use as a space launcher (a variant was the first reliable means to transport stuff to orbit, which is huge) than as an ICBM. Non-storable liquid fuels, huge soft surface launch sites, could only be kept on alert for 24 hours, etc. The Atlas was much more practical. Like the R-7, it was used for the first American manned orbital space launches, and became the basis of a very successful and prolific family of launch vehicles (its most recent derivative, the Atlas V, is undergoing conversion to a human-rated system, intended to ferry new capsules to the ISS).

Titan series
The Titan I and Titan II were much better as space launchers than ICBMs, really. Liquid propellants and all; the Titan I didn't even have storable liquid propellants, so it had to be fuelled in the silo. They had to have very huge, very extensive launch complexes for some reason. The Titan II remained in service until the 1980s, though; it carried a large multi-megaton warhead, which gave the US a useful capacity in that respect.

LGM-30 Minuteman
Today, the LGM-30G Minuteman III is the only land-based ICBM in US service; it outlasted its designated successor, the LGM-118A Peacekeeper. It may stay in service as late as 2040. Today, it carries three MIRVs and penetration aids and countermeasures. Solid-fuelled; quick reaction time. The Minutemen have always had these digital guidance computers; back in the '60s, the demand for ICs (integrated circuits) that they produced (for the Minuteman II, mainly) drove down the price of ICs and led to substantial improvements, so allowing for the subsequent revolution in microelectronics. Also they were more or less the first modern, mass-manufactured embedded systems anywhere.

LGM-118A Peacekeeper
Originally known as the "MX" (Missile eXperimental), this was a response to the R-36M/SS-18. The US believed it was in a "window of vulnerability", where the Soviets could destroy the counter-force capabilities of the USA (the bombers and the ICBMs) in a first strike, leaving the US only with submarine launched missiles, which weren't accurate to be used against anything other than cities. Therefore they would "win" a nuclear war.

With up to 10 300KT warheads, the Peacekeeper was later planned to be rail-mobile, but there wasn't enough money and the Cold War ended, so they were kept in the silos they were first stuck in (to "demonstrate national will") instead. One of the proposed basing options would have involved several launch silos and a missile train that would move between them, which is this troper's favourite, because it sounds like Whack-A-Mole.

Now retired from US service, surplus Peacekeepers have been modified by the private corporation Orbital Sciences to become the Minotaur IV orbital launch system.


 * A quick search on Google reveals a romance novel by Vicki Hinze called Lady Liberty, where two agents have to get a briefcase back to Washington DC to stop one of these being launched.
 * One destroys Mount Rushmore in a 1997 film called The Peacekeeper.

MGM-134 Midgetman
Also known as the Small Intercontinental Ballistic Missile, it was the American answer to the RT-23/SS-24 rail-mobile and RT-2PM/SS-25 road-mobile ICBMs. Like SS-25, the whole missile system was carried and could be launched from a wheeled transporter. It was equipped with a single reentry vehicle.

SM-62 Snark
One of the first long-range strategic missiles in US service, and an intercontinental cruise missile. Formed an important part of the US strategic deterrent for a very brief time until ICBMs made it totally obsolete. Suffered so many test failures that the area of the Atlantic off Cape Canaveral was dubbed "Snark Infested Waters".

SM-64 Navaho
A North American Aviation offering, from the same people that brought you the P-51 Mustang and the F-86 Sabre. A supersonic intercontinental cruise missile. The project ended up a failure and was cancelled, but the importance of the Navaho in helping along technological development can't be understated.

Four words, Supersonic Low Altitude Missile (SLAM)
Also known as Project Pluto, a Code Name initially for the engines but eventually applied to the whole project. It is probably the nastiest weapon ever seriously conceived. A nuclear-powered cruise missile which would have penetrated Soviet airspace at Mach 3, dropping hydrogen bombs on its unlucky targets. Some questioned whether it would even need a warhead; the thing had an unshielded 500MWt fission reactor (Project Pluto being the codename for the project that was developed under), which would have been rather lethal to everyone within a substantial radius had the thing just flown overhead. Not to mention the fallout plume that the thing would have left, the massive shockwave that an object like that produces flying Mach 3 at treetop level and the sheer noise. The final target was in for a pretty nasty surprise, too, even if the thing ran out of bombs; the thing would really drive down property values wherever it crashed, to say the least. Critics dubbed it "Slow, Low And Messy". The US, deciding that the thing was a) too provocative in the Arms Race and b) too dangerous to even test fly, cancelled the project in 1964.


 * An air-launched version called XK-PLUTO appears in Charles Stoss's A Colder War. The missiles are intended