We've been using JDAM's for several years. It's probably the #1 PGM. The JDAM is a (relatively) cheap tailkit that can be fitted to unguided bombs to give them GPS guidance.
I'm not sure what show you saw, the US has 3 Iowa Class Battleships, but they are in ready reserve, not active service. What you probably saw was a test of GPS guided shells, not JDAM's. This is something we are working on, but they are not in service yet.
Some stuff about BB's:
It can throw about 26,000 lbs. of HE in a single salvo. One Battleship has more firepower than the entire B-52 fleet. It can deliver the same amount of tonnage in one hour that the B-52 fleet can deliver in 7 days of 24/7 operations.
Every 30 seconds just one Iowa class battleship firing only it's primary guns can put 24,300lbs(11,046Kg) of steel on target. That's 5,832,000 lbs. of steel (2,650,909Kg) in just two hours. That's the equivelant firepower of about 10 carrier air wings, and that's not even including it's TLAMs or 5" guns.
A rocket assisted 16" shell can fire out to 50 nm., and an 11" rocket assisted sabot round can go 90nm. With GPS guidance, they don't miss.
This is what one looks like when it's pissed off.
15 Gun Broadside(9, 16 inch guns and 6, 5 inch guns).
/hijack off
I'm not sure what show you saw, the US has 3 Iowa Class Battleships, but they are in ready reserve, not active service. What you probably saw was a test of GPS guided shells, not JDAM's. This is something we are working on, but they are not in service yet.
Some stuff about BB's:
It can throw about 26,000 lbs. of HE in a single salvo. One Battleship has more firepower than the entire B-52 fleet. It can deliver the same amount of tonnage in one hour that the B-52 fleet can deliver in 7 days of 24/7 operations.
Every 30 seconds just one Iowa class battleship firing only it's primary guns can put 24,300lbs(11,046Kg) of steel on target. That's 5,832,000 lbs. of steel (2,650,909Kg) in just two hours. That's the equivelant firepower of about 10 carrier air wings, and that's not even including it's TLAMs or 5" guns.
A rocket assisted 16" shell can fire out to 50 nm., and an 11" rocket assisted sabot round can go 90nm. With GPS guidance, they don't miss.
This is what one looks like when it's pissed off.
15 Gun Broadside(9, 16 inch guns and 6, 5 inch guns).
/hijack off