Security and useability are two different things.
https://www.digitaltrends.com/mobile/us-army-android-phones-iphones/
That's fake news and iPhone still doesn't do split screen.
Earlier ATAK was based on 2012 Galaxy Note II on 32nm node so, yes, it can run warm in extreme desert environment if not using hardware video decode. Later version of ATAK uses what appears to be a 2015 Galaxy S6 or Galaxy Note 5 on 14nm node which makes more logical sense than switching to iPhone 6S with worse issues like short battery life, extreme cold weather intolerance, premature shutdown at ~30%, performance throttling, half the DRAM, worse water resistance, etc.
2014 video showing 2012 Galaxy Note II ATAK
Late 2017 video showing 2015 Galaxy Note 5 ATAK
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