04/04/1965
https://www.presidency.ucsb.edu...
"I also want you to know that I am grateful for your willingness to remain available to serve your country when needed."
"Your leadership has been vital to our record economic progress."
"You and Mary have been a source of great strength to Lady Bird and me."
"It is never easy to part with a member of our official family or adequately to convey how much we will miss him."