The internet of things, that loose assortment of tiny sensors now embedded in seemingly everything, can collectively do a lot. Each individual sensor isn’t capable of very much but when combined with billions of others, they can map human behavior, help to predict everything from shopping trends to the weather, and perform millions of other tasks, both mundane and critical. They are even making their way into heavily industrialized applications, and have also been hijacked and used for bad things, like the world’s largest botnet attack. But despite their seeming hegemony and limitless potential, there are a couple places where the tiny sensors have yet to gain much of a foothold. One of them is deep in the world’s oceans, and the other is on the frontlines of today’s modern battlefield. The armed forces want to change that, with the Navy working to develop its own flotilla of seafaring IoT vessels and the Army bringing the technology to battlefields.