Echo and SCORE
'Telstar wasn't the first satellite to bounce radio signals, that was "Courier 1B" from whose name one can identify as a military project'
Courier 1B is pre-dated by Echo 1 which was a passive communication satellite - nothing more than big reflective mylar balloon which reflected signals. Echo 2 followed in 1964 by which time it had been superceded by active satellites.
SCORE was the first satellite to broadcast from space, it could play pre-recorded messages and receive new ones for later broadcast.
Courier was the first active satellite which received, amplified and rebroadcast radio signals in real time.