Title : Israel - Keystone of the Middle East
https://apps.dtic.mil/docs/citations/ADA526201
Henry A. Kissinger, calling for $2.240 billion in military and economic aid in loans and credits to Israel, said today “the keystone of our policy in the Middle East has always rested on the ability of Israel to persevere in its own defense.”
https://www.jta.org/1975/11/07/archive/kissinger-aid-to-israel-is-keystone-of-u-s-policy-in-the-middle-east
Mossad: the Keystone spooks
https://www.telegraph.co.uk/news/worldnews/middleeast/israel/7280578/Mossad-the-Keystone-spooks.html