Today, there exist commercial products offering ‘‘Field and Forget’’ solutions for military operations. One recent example
is Lockheed Martin’s Self Power Adhoc Networks (SPAN) [30], unveiled at the 2013 Annual Meeting and Exposition of the
Association of the United States Army (AUSA). While sensor nodes are not yet being dropped off planes, they can now
coordinate with them: in October 2013 Lockheed Martin announced their plans to integrate SPAN, their ground sensor
network, with unmanned aerial vehicles [31]. Marketed as a covert, perpetually self-powered wireless sensor network, SPAN
uses energy harvesting and low-power wireless communication in a mote-like device that has caught the attention of the
popular press, which has dubbed it as spy rock to underscore its potential for camouflage [32].