About 2 years ago, when my Son decided HVAC. BOTH said that the USAF is big on Chiller Training. I had never heard of Chiller Systems. They told me they are responsible for cooling Computer Systems. A VERY important thing on many Military Bases and Govt Installations. One of the fellas told me that HE had a Bud that went through the USAF, got out and eventually landed a job working directly with Amana or Trane and dealing with Chiller Systems. They said that within 6 years after the USAF he was raking in very close to six figures a year.