Тест ЖРД RS-25 для ракеты SLS

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On the Space Launch System (SLS), new expendable versions of the engines are planned once the initial inventory of engines(SSME) from the Shuttle program are used up, the development of cheaper expendable versions of the engine has a long history, most notably proposed in the 1990s with the National Launch System (NLS).[45][46] The SLS's expendable RS-25, in clusters of three, four or five, is being studied, each draw their propellant from the rocket's core stage. They provide propulsion during the first stage flight of the SLS, with additional thrust coming from two boosters. Following staging, the engines are discarded along with the rest of the core stage.

Following the retirement of the Space Shuttle, NASA announced on September 14, 2011, that it would be developing a new launch vehicle, known as the Space Launch System (SLS), to replace the shuttle fleet.[47] The design for the SLS features the RS-25 on its core stage, with different versions of the rocket being installed with between three and five engines.[48][49] The initial flights of the new launch vehicle will make use of flown Block II RS-25D engines, with NASA keeping the remaining such engines in a "purged safe" environment at Stennis Space Center, "along with all of the ground systems required to maintain them."[50][51] In addition to the RS-25Ds, the SLS program will make use of the Main Propulsion Systems from the three remaining orbiters for testing purposes (currently being removed as part of the orbiters' decommissioning), with the first two launches (SLS-1 and SLS-2) possibly making use of the MPS hardware from Space Shuttles Atlantis and Endeavour in their core stages.[49][51][52] The SLS's propellants will be supplied to the engines from the rocket's core stage, which will consist of a modified Space Shuttle external tank with the MPS plumbing and engines at its aft, and an interstage structure at the top.[6] Once the remaining RS-25Ds are used up, they are to be replaced with a cheaper, expendable version, currently designated the RS-25E ('E' for expendable).[6] This engine may be based on one or both of two single-use variants which were studied in 2005, the RS-25E (referred to as the 'Minimal Change Expendable SSME') and the even more simplified RS-25F (referred to as the 'Low Cost Manufacture Expendable SSME'), both of which were under consideration in 2011.[32][53]

Двигатель от Шатлов RS-25D, делают аж две модификации RS-25E и RS-25F
http://en.wikipedia.org/wiki/Space_Shuttle_main_engine

On January 9, 2015, NASA began test firing the RS-25 for use on the Space Launch System, for the first time since the shuttle program.