As explained later on, this is dog-Latin for “We who are about to die don’t want to”. The original quote is of course “Morituri Te Salutant” — “We who are about to die salute you”, said in Roman amphitheatres by the gladiators to the Emperor.
Also, the mission badge bears a striking resemblance to the NASA badges worn by astronauts and to the NASA logo itself, down to the oval path around the central object.