When I was just a punk enlisted Air Force E-1 in basic training, they took my picture and sent it along with a press release to my home town paper saying I graduated from basic.
That the general who'd just hired himself a new pilot trainee would send a letter to his dad is just, so..... SO WHAT?
The worst interpretation that can be put on this is that the General was sucking up to the Congressman... not an unheard of thing. Which may dim the General's luster but not Bush pere's, and certainly not Bush fis's.