AFpilot,
Thanks for posting, that brings up a really interesting issue...DoDI 1332.39 was rescinded as a result of the 2008 National Defense Authorization Act due to the fact that it improperly deviated from the VASRD (1996 was the most recent publication). BUT- I can see some people referencing it either out of habit or by not realizing it was rescinded....my thought is that if this is favorable to the member, fine...but, if the calculations using the formulas are more beneficial to the member, then they have to do the hard work and do the math!!
(Likely, cases with "close calls" as to percentage should be resolved via application of resolution of reasonable doubt rule...but the PEB may not apply this correctly).