Which rotary-wing movement technique is used when enemy contact is imminent?

Bounding Overwatch is the correct answer because this technique allows for a coordinated movement where one element provides covering fire while the other element moves to a new position. This is particularly effective when enemy contact is anticipated, as it allows the unit to advance while maintaining a defensive posture against potential threats.

In this method, the team can alternate roles: while one element moves forward, the other can engage the enemy or provide reconnaissance, greatly enhancing operational security during movement. This method also facilitates a more dynamic response to enemy actions, as the overwatch element can deter or suppress enemy fire while the bounding team maneuvers.

The other techniques involve different levels of contact and engagement, such as traveling, which may not provide adequate security when contact is imminent, or traveling overwatch, which can offer some covering fire but may not be as effective as bounding overwatch in ensuring maximum safety and responsiveness in high-threat situations. Hovering fire is generally used for a different purpose, primarily as a direct attack stance rather than a movement technique under imminent threat.