Regulus-I was one the the navy's first ship and sub based cruise missiles. yes is was a standard jet motor as are most if not all the cruise missiles of today...Rocket boosted, jet JP-1 fueled sustainers engines.
Like most things the originals.. are usually Big bulky slow things, that get smaller and faster as the tech improves.
Look at the USAF hounddog it's a very streamlined missile strapped to a HUGE HONKIN Jet engine. really funny if you think about it
Because a cruise missile is designed to be able to travel llooonngg distances, and a rocket motor isnt the sort of thing to do that. And if there was a rocket motor that could burn for however long a cruise missile is propelled for, the missile would probably go too fast and disentergrate (sp?)... The rocket motors on 'em are just to get it up in the air so the jet can take over.
Erm... Im not sure about this but are they cheaper?
Maybe because cruise missiles are easier to deal with for polotics or something. Ie, We have launched 300 tomahawks at you capital city. You have around half hour till impact to take shelter. With a ballistic missile: We have launched 300 ballistic missiles at your capital city. You have 2 minutes to take cover.
Cruise Missiles are certainly more precise then ballistic ones.
there are many reasons, cruise missiles can attack one target extremely accuratly from long distances. ICBMs are more expensive and are not as accurate and they have like 10 warheads, which are nukeclear.
you use cruise missiles "without the fuss of mass destruction"