It has nothing to do with being invited
There are certain traditions and protocol for these procedures and services .. which you seem to be ignoring
I know it has nothing to do with being invited, I was hoping to prevent someone from saying that the Ford family controlled what goes on for a Presidential funeral. Truman received FDR's casket, Nixon recieved both Eisenhower and Johnson, and yes, even Clinton received Nixon at Andrews...so who's ignoring tradition here, hmmm?