Both Tubes (Achievement)

Both Tubes is an Achievement in Halo 3: ODST. It is unlocked when the player gets 10 kills with a Rocket Launcher during the Kizingo Boulevard Mission. It is worth 5 Gamerpoints.

Trivia

 * An easy way to do this is to either play co-op, or if you are playing solo, trade your rockets with a marine, then kill him. The rocket will have extra ammo.