The Titan IV-B version started flying in 1997.
The rocket costs taxpayers $411 million plus the price of the classified satellite. It weighs 2.1 million pounds at launch. The rocket stands as tall as a 16-story building and consists of a two-stage rocket plus two large solid-fueled boosters.
Future large satellites will be launched on the Delta IV and Atlas V vehicles, which are less expensive and use fuel that is more environmentally benign.