Boeing X-51 waverider is a scramjet used to increase the propulsion speed of missiles.The Hypersonic Air-breathing Weapon Concept (HAWC) program is a joint DARPA/U.S. Air Force (USAF) effort that seeks to develop and demonstrate critical technologies to enable an effective and affordable air-launched hypersonic cruise missile upto mach 5 speeds (achieved Mach 5.1 with X-51 scramjet).
Tactical Boost Glider is the main weapon for US PGS program. TBG, a high-speed glide weapon launched from a common vertical launch silo, follows in the Mach 20 contrails
of the Falcon HTV-2 experiments that failed in 2010 and 2011.
The U.S. military is pouring money into hypersonic research, and it’s making China and Russia —which have their own similar programs — nervous. But the accelerating effort to build missiles that fly at speeds between Mach 5 to Mach 19
is also alarming some in the nonproliferation community. Despite Pentagon officials’ assurances that superfast weapons will carry only conventional warheads
, some believe that other nations may well treat any hypersonic launch as a potential nuclear strike.
TBG is not Mach 5 but much higher than that. After 2 failed test US hasn't tested it yet. Meanwhile China conducted some 6-8 tests & all of them were a success ( But China's TBG speed is only Mach 5 ) . Russia's Yu-71 is already talked about. They will be testing it again in 2016( 1 test only.)
The history of U.S. advances in hypersonics is intertwined with nuclear weapons research
. The US has tested maneuvering reentry vehicles which were intended for nuclear delivery. The Advanced Hypersonic Weapon, successfully tested in 2011 .
So it means till date US nuclear warheads RV weren't maneuvering ?
U.S. is also planning to spend more on modernizing U.S. ICBMs which includes to extend the life of a number of nuclear warheads (refurbishing the warheads to last for the next 30-50 years
). Strategic delivery systems being replaced with new systems or completely rebuilt with essentially all new parts
.In defence US will use THAAD-ER to kill hypersonic gliding vehicles