Besides Israel and, as of recently, Ukraine, Egypt is the biggest receiver of US military "assistance". Most military officials have attended elite U.S. military academies and the two forces work closely together.
The 2011 revolution successfully outed Hosni Mubarak (another Egyptian dictator propped up by the US). Following the 2012 elections came the 2013 coup by Sisi. Except, the US was one of the few countries in the world that refused to label this a "coup". The Rabaa Massacre marked the definitive end to the Arab Spring in Egypt