Which term describes an airborne threat that passes through a defensive layer?

• A. A decoy
• B. A friendly aircraft
• C. An airborne threat that passes through a defensive layer
• D. A ground-based obstacle

Answer: (C)

The key idea is recognizing how a defense categorizes threats by whether they get through a layer. The term in question is defined as an airborne threat that passes through a defensive layer, which directly captures the situation where the defense layer fails to stop the threat and it continues onward. This distinction matters because it highlights penetration of defenses and the need for additional or higher-level protection to counter such threats. In contrast, a decoy is simply a lure and not an actual threat, a friendly aircraft is not hostile, and a ground-based obstacle operates on the ground rather than in the air.