Watch ULA abort a rocket launch at the last moment
 

Most rocket launch aborts are largely uneventful, but United Launch Alliance’s latest was... dramatic. The spaceflight outfit had to abort its NROL-44 mission (via Parabolic Arc) just three seconds before it was due to start, with the Delta IV rocket...

https://www.engadget.com/ula-aborts-...205931211.html