What Rocket Am I?: Quiz 6

Clue 1: I was developed by NASA and Vought in the United States.
Clue 2: I was first launched in 1961.
Clue 3: I am 22 meters tall.
Clue 4: I served for over 30 years in various configurations.
Clue 5: My payload to low Earth orbit is about 45 kg.
Clue 6: I am the first all-solid propellant orbital launch vehicle.
Clue 7: I launched the Explorer 9 atmospheric balloon satellite.

Yes, I am Scout.

I was used for numerous scientific and military satellites until 1994.