Which of the following is NOT a listed entry technique?

Which of the following is NOT a listed entry technique?

• A. Buttonhook
• B. Modified buttonhook
• C. Criss cross or X pattern
• D. Sine wave

Answer: (D)

Entry techniques are specific patterns teams use to enter and clear a doorway or interior while maintaining coverage and minimizing exposure. The patterns listed—buttonhook, modified buttonhook, and criss cross (X) pattern—are established methods that control the doorway area and angles as the team enters, with each pattern designed to keep the lead observer watching the threshold and ensure teammates cover potential threat angles as they move in. A sine wave, however, describes a curved movement path rather than a defined doorway-entry pattern. In standard training, it isn’t one of the recognized entry techniques taught for deliberate room or doorway entries. So the best choice is that sine wave is not a listed entry technique.

Entry techniques are specific patterns teams use to enter and clear a doorway or interior while maintaining coverage and minimizing exposure. The patterns listed—buttonhook, modified buttonhook, and criss cross (X) pattern—are established methods that control the doorway area and angles as the team enters, with each pattern designed to keep the lead observer watching the threshold and ensure teammates cover potential threat angles as they move in. A sine wave, however, describes a curved movement path rather than a defined doorway-entry pattern. In standard training, it isn’t one of the recognized entry techniques taught for deliberate room or doorway entries. So the best choice is that sine wave is not a listed entry technique.