Original sentence: Also, Endeavour’s crew will leave the OBSS (Orbiter Boom Sensor System) on the ISS.ExPRESS Logistics Carrier (ELC-3).It is currently slated to be the final flight of the Space Shuttle program.STS-134 is a planned Space Shuttle mission with  that will deliver the Alpha Magnetic Spectrometer and a fourth ExPRESS Logistics Carrier to the International Space Station
Edited sentence: ExPRESS Logistics Carrier 3 (ELC3).NASA management is currently studying the possibility of leaving the Orbiter Boom Sensor System (OBSS) permanently attached to the station after the last shuttle mission.STS-134 is a planned Space Shuttle mission with  that will deliver the Alpha Magnetic Spectrometer and the third ExPRESS Logistics Carrier to the International Space Station.The feasibility of leaving the OBSS attached to ISS for a long period of time has also been demonstrated when the STS-123 mission left it behind for use by STS-124 two months later.The usefulness of having the OBSS available for use at the station was demonstrated during Scott Parazynski's repair of the torn P6 solar panel on STS-120