"Merlin is a family of rocket engines developed by SpaceX for use on its Falcon 1 and Falcon 9 launch vehicles. SpaceX also plans to use Merlin engines on its upcoming Falcon Heavy launch vehicle. Merlin engines use RP-1 and liquid oxygen as rocket propellants in a gas-generator power cycle. The Merlin engine was originally designed for sea recovery and reuse.
The injector at the heart of Merlin is of the pintle type that was first used in the Apollo program for the lunar module landing engine (LMDE)."
Oh Space X, that recent classified payload launch...satellite still stuck to second stage rocket? Did it really ker-splash into the Pacific or...
Did it?
Classified ya know...