The past several centuries have largely been defined by physical security threats, requiring a nation’s military to physically respond with whatever means they have available. But as explained by Isaiah Wilson III—president of Joint Special Operations University—today we face “compound security threats,” which include physical security threats as well as …

Quantum cryptography is an emerging technology in which two parties may simultaneously generate shared, secret cryptographic key material using the transmission of quantum states of light. A unique aspect of quantum cryptography is that Heisenberg’s uncertainty principle ensures that if Eve attempts to intercept and measure Alice’s quantum transmissions, her …

The helicopter is a type of aircraft which is lifted and propelled by one or more sets of horizontally revolving overhead rotors.  It has two rotors that spin several blades. A blade is a tilted airfoil, just like an airplane wing. As it speeds through the air, each blade generates …