content: They did mention railguns, but not the other two.  The next step is a rail gun. A rail gun uses electro-magnetic force to launch a solid projectile at extremely high speed and with great destructive force. The Navy would like a railgun to deliver projectiles at up to 200 miles from the launcher, with a circular error probability of five meters. Like the AGM, the rail gun could fire 6-10 times per minute, and unlike the AGM the projectiles would be inexpensive and easy to store. Considerable technical challenges remain, but a ship the size of USS Montana, with high energy production capacity, is a great bet to act as a platform for at least one rail gun. In the end, the USS Montana would have two railguns, capable of launching tungsten rods at targets 200 miles away, with the ability to wreak utter destruction based on kinetic energy alone.