Apollo 1 
In memory to
Virgil "Gus" Grissom, Edward H. White and Roger B. Chaffee
If we die, we want people to accept it. We are in a risky business. The conquest of space is worth the risk of life.
(Gus Grissom)

 Roger B. Chaffee - Edward H. White - Virgil "Gus" Grissom