The B-lB is being developed to modernize the strategic bomb-er fleet. Its advanced avionics equipment and reduced radar cross section will aid in penetration of enemy defenses. The B-lB will carry heavy weapons payloads.

Studies for the B-1 were initiated in 1965. Characteristics planned for the advanced bomber were established following de-tailed studies of strategic concepts and numerous point designs. The B-lB is a derivative aircraft which has been developed in response to strategic needs.

The United States' strategic deterrent depends heavily on the Strategic Air Command bomber force. This manned strategic bomber force can respond to changing combat situations and provides several options to the National Command Authority. The core of this force is the B-52, which has been modernized, but whose fundamental technology was developed in the 1950s.

The B-lB takes advantage of the many advances made in air-frame, engine, and avionics during the past 20 years. It will become a viable weapon in the mixed-force concept of manned bombers. land-launched, and sea-launched missiles.

The aircraft is designed to be compatible with KC-135 and KC-10 tankers, but is capable of intercontinental missions without aerial refueling. It has quick takeoff capability and improved hard-ness to nuclear weapons effects, which will improve the bomber force's ability to survive a surprise enemy submarine-launched missile attack.

The B-lB can carry practically any type ordnance now in the Air Force inventory, plus advanced weapons which are being studied or developed. Weapons-carrying capability includes gravity, Short Range Attack Missile (SRAM), and Air-Launched Cruise Mis-sile (ALCM).