Excellent! I have concluded that the "Nixon" signature is authentic, so that Cambodia story must be true!
BTW, as a former Air Force officer I can tell you that no one ever referred to an Officer Effectiveness Report as an OERT. They are called OER's or simply, ER's.
OETR stands for Officer Education Transcript Repository, according to AFI36-2305, so Bush must have been overseeing one of those, and Killian refused to sugar coat his rating of it. No doubt some of the paperwork he was doing in Alabama. He couldn't have been refering to Bush's OER, since he had completed that in May of 1973, and would not have to do another, since Bush had cleared the base on May 15, 1972. /sarc