Torpedo
The term for the self-propelled missile or vehicle is "rocket."The similar proper noun, a New York dance company, is the Rockettes.
The root of missile is miss-, meaning "sent" (c.f. missive, mission).
Missile Deffence Alarming System
The world situation was the Cuban Missile Crisis. The Soviets had started to build an arsenal of missiles on the island. The US feared medium and long-range missiles could be launched against North and South America, meaning US, Canada, Mexico, and as far as Peru.
The anit-aircraft missile was intimidating.
Torpedo
The modern definition of a torpedo is a self-propelled underwater missile. (see related question)
It's a submarine-launched ballistic missile system comprised of the Trident missile, the special Trident warheads and the Ohio-class ballistic missile sub.
The Soviet Union built 4 new classes of submarine-launched ballistic missiles and over 60 new missile submarines.
The M45 submarine-launched ballistic missile was first tested in 1986. It was fired in 2004 from the Vigilant at a target near French Guinea, which it hit.
Trident Ballistic Missile Submarine
In the American submarine force their are two types of missiles: 1. Tomahawk® Land Attack Missile (TLAM) 2. Sea-launched ballistic missile (SLBM) A multiple independently targetable reentry vehicle (MIRV) warhead is what is deployed on a SLBM. The TLAM can carry a conventional warhead or a single nuclear warhead.
An ALBM is an air-launched ballistic missile, a ballistic missile launched from a bomber.
The answer to this multiple-choice question was a torpedo. The reason that the question specifies "usually" is that ASW aircraft can launch torpedoes.(The word missile in military usage always means self-propelled weapons.)The ASROC is a rocket-boosted torpedo, and many other types of missiles are launched from ships and submarines, including cruise missiles such as the Tomahawk. Trident (FBM) submarines can launch strategic ICBMs.*All submarine weapons are actually ejected from the vessel prior to its activation: torpedoes are ejected by water impulse, as are SUBROC, Harpoon, and Tomahawk missiles. Their motors start once they've cleared a certain range from the vessel. Ballistic missiles are ejected by air impulse - launch is near the surface, and the missile is ejected into a pocket of air or steam where the rocket motor ignites.
A TRIDENT Submarine most likely refers to the US Navy's OHIO Class Submarines (18 of these were built) They often bear the name of TRIDENT because they were designed to carry Trident Missiles - a submarine launched intercontinental ballistic missile with nuclear warheads.
Modern submarines carry a wide variety of weapons. An example of a U.S. Navy Fast-Attack Submarine weapons capability includes: Homing Torpedoes (Active and Passive Sonar) Tomahawk Land-Attack Missile (Conventional and Nuclear) Tomahawk Anti-Ship Missile Harpoon Anti-Ship Missile Mines Ballistic Missile submarines can carry those weapons as well, but their primary mission is Nuclear Deterrence, and as such their main weapons are Submarine Launched Ballistic Missiles (SLBM's).
A torpedo...