Reddit reviews Legion of the Damned

https://www.amazon.com/gp/aw/d/0441480403/ref=mp_s_a_1_4?qid=1451393704&sr=8-4&pi=AC_SX236_SY340_QL65&keywords=william+c+dietz&dpPl=1&dpID=51MlGQICJqL&ref=plSrch

I'm Horrible because i think you'd like this military sci fi book.

• Cryptonomicon
  
• Legion of the Damned
  
• Snow Crash
  
• Daemon
  
• Ubik
  
• River of Death
  
• 20,000 Leagues
  
• Halo: The Cole Protocol
  
• Halo: Ghost of Onyx
  
• READY PLAYER ONE

I liked Legion of the Damned by William Dietz. Not exactly what you're looking for, but it's about encased brains plugged into power armor, mechs, warbots, etc.

http://www.amazon.com/Legion-Damned-William-C-Dietz/dp/0441480403