Corrected entry: After Gemini 8 reaches Earth orbit, Neil Armstrong tells Houston "We have SECO." SECO is Saturn Engine Cut-Off, which would be the appropriate term on an Apollo flight, as they were all launched on either Saturn V or Saturn I-B boosters. The Gemini missions, on the other hand, used a modified Titan ICBM as their launch vehicle, so speaking of a "Saturn Engine Cut-Off" in the context of a Gemini flight makes no sense.
Friso94
21st Jan 2019
First Man (2018)
Correction: That's because SECO does not stand for Saturn Engine Cut-Off. In any launch (you can watch them all the time now, since most US-based launches are live-streamed) they always have the callouts MECO and SECO, standing for Main Engine Cut-Off (first stage) and Second Engine Cut-Off (second stage). NASA's own list of acronyms confirms: https://www.nasa.gov/pdf/140648main_ESAS_17a.pdf.
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Correction: "We have SECO" was part of the actual Gemini 8 transcript. It can be found in the mission transcript, 3/16/66, 8:58 a.m. Tape 20.