A side show of energy security are direct military applications. It is important to point out that the energy cosumption of military forces is overall tiny compared to one of the civil world. While 'green' initiatives by the military can have merit they should arguably closely linked to military capability and not global sustainability. For a country facing a big war effort saving in civilian consumption has just so much more scope and arguably efficiency then doing so in the military itself. This doesn't of course mean that the armed forces shouldn't try to identify the lower-hanging fruits and sensible targets and picking those.
Military e-mobility is of course a diverse topic and it's application depends, like in the civilian world, on the specific circumstances. An electric MBT for example would be right now a lot of steps backwards in key areas like march speed, range and 'refueling'. On the other side of of the spectrum are micro drones which give the soldiers an eye up in the sky. In that case electric power has no competitor.
Staff like the Velocopter are highly interesting, but there much will depend on the development of battery price and density in the next decades. More on it's homepage.
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