What action is used to call for a head count?

The correct action to call for a head count is tapping the head with one hand. This gesture is widely recognized in military operations as a signal to gather individuals for a head count. It is a simple, effective, and discreet way of alerting team members that they should assemble and confirm their presence without causing significant disruption or attracting undue attention.

Utilizing this method is important in situations where silence or stealth may be necessary, thereby ensuring that the communication remains covert. This strategy often reinforces discipline and awareness among personnel in operational contexts, reflecting a level of professionalism expected in military settings.

While other options may involve physical gestures to draw attention, they lack the specific connotation and recognition associated with signaling for a head count. Thus, tapping the head with one hand stands out as the appropriate action in this context.