In many ways, helicopters are less suitable for stealth technology than fixed-wing aircraft are; one such area is their rotor blades, which not only generate copious noise levels but can also give off a strong radar signature. However, blade designs have been developed that can significantly reduce noise,[2] which has traditionally been a major issue for any operation involving the clandestine use of helicopters.[3] Numerous helicopters have incorporated profiled fuselages to reduce their radar cross-section (RCS), constructing elements of the rotorcraft from certain materials is another means of minimising radar visibility.