I'd say its not, as evidenced by the ousting of Hosni Mubarak in 2011. The US doesn't even have a military base in Egypt. The closest we've got are in Etrea and Tripoli, with our West African bases getting squeezed out by the recent wave of military coups. Israel, Jordan, and Saudi Arabia are fundamental to our control of the region.
I don’t think there’s any strategy involved in the support of israel