An optical resonator can include an optical feedback structure disposed on a substrate, and a composite including a matrix including a chromophore. Other features include hinges allowing the base structure to be folded. The group communication server determines a set of events to log based on the fault, and instructs components that host the group communication to begin logging a set of events. In this manner, tags in the possession of unauthorized employees can be remotely disabled, and weapons lost on a battlefield can be easily tracked and enabled or disabled automatically or at will.