On duty military personnel—on the ship and attending the President—all wear headsets. For personnel talking to others on the bridge, this appears to be a passive mechanism with no controls, perhaps for having an audio record of conversations or ensuring that everyone on the bridge can hear one another perfectly at all times.
Personnel communicating with people both on the ship’s bridge and the president have a more interesting headset.
The headsets have antennas rising from the right ear, and each is tipped with a small glowing red light. This provides a technological signal that the device is powered, but also a social signal that the wearer may be engaged in remote conversations. Voice technologies that are too small and don’t provide the signal risk the speaker seeming crazy. Unfortunately this signal as it’s designed is only visible from certain directions. A few extra centimeters of height would help this be more visible. Additionally, if the light could have a state to indicate when the wearer is listening to audio input that others can’t hear, it would provide a person in the same room a cue to wait a moment before getting his attention.
Each headset has a default open connection, which is always on, sending and receiving to one particular conversant. In this way General Staedert can just keep talking and listening to the President. Secondary parties are available by means of light gray buttons on the earpieces. We see General Munro lift his hand and press (one/both of?) these buttons while learning about the growth rate of the evil planet.
The strategy of having one default and a few secondary conversants within easy access makes a great deal of sense. Quick question and answer transactions can occur across a broad network of experts this way and get information to a core set of decision makers.
The design tactic of having buttons to access them is OK, but perhaps not optimal. Having to press the buttons means the communicator ends up mashing his ear. The easiest to “press” wouldn’t be a button at all but a proximity switch, that simply detects the placement of the hand. This has some particular affordance challenges, but we can presume military personnel are well trained and expert users.