100% correct.. I have seen numerous formal and informal letters from various legal departments and investigative personnel using bullet points.Answer: a Lawyer
As for the Go Bucks! That one is also easy. Many times when people are caught off guard or nervous about respond to something negative they tend to end their communications in a light hearted way in order to make themselves feel more comfortable with their involvement. However, it could be CJT's normal sign off to emails he receives and done purely out of habit.