Thanks to Viktor for pointing this out. Read his diary
here
These are important for fleshing out the Bush TANG story. The first one shows that Killian was concerned about Bush and Bath's "flight certification status" in February 1972, at a time when Bush is rumored to be doing drugs. He is also rumored to have crashed a jet. We do know that he spent a lot of time in a trainer that spring (remedial training?). It also connects Bush and Bath together more tightly.
The other one provides a trail to the CYA memo, showing that in June, Killian was asked to fill out an OETR for Bush.
It also provides documentation that Bush really did do some of the make-up drills in the summer of 1973.