Updates This Week in NASA History: 1st RS-25 Engine Test of 2015 – Jan. 9, 2015 by NASA, Aliens & KouroshJanuary 13, 2021 This week in 2015, NASA engineers successfully conducted the first hot fire test of the RS-25 engine and engine controller unit on the A-1 test stand at NASA’s Stennis Space Center. Source:: updates 2 Related