Prime Minister Benjamin Netanyahu's recent statement that Israel can't defend itself with borders drawn along pre-1967 lines has been questioned in certain foreign policy circles. These critics have noted that Israel successfully fought two wars, in 1956 and in 1967, while based within those borders. And they have claimed that borders don't matter as much in modern warfare. But Netanyahu is right.
The idea that the 1967 line isn't defensible has actually been around for decades. Indeed, the architects of Israel's national security doctrine reached that conclusion soon after the Six-Day War. The main strategic problem that Israel faced at that time was the enormous asymmetry between its small standing army, which needed to be reinforced with a timely reserve mobilization, and the large standing armies of its neighbors, which could form coalitions in times of tension and exploit Israel's narrow geography with overwhelming numbers. True, Israel won in 1967, but the war also pointed out the country's many vulnerabilities.
In the years following the war, the main advocate for creating new boundaries to replace the fragile lines from before 1967 was Yigal Allon, then Israel's deputy prime minister. Allon had considerable military experience, having commanded the Palmach, the elite strike units of the Jewish forces, in the 1948 war that created Israel.
In 1976, while serving as foreign minister, Allon wrote an article for Foreign Affairs outlining the strategic logic for his position. He pointed out that the 1967 line was an armistice line from Israel's war of independence and never intended as a final political boundary. Allon quoted the U.S. ambassador to the United Nations in 1967, Arthur Goldberg, who said that the 1967 line was neither secure nor recognized. Given this background, U.N. Security Council Resolution 242, backed by both the United States and Britain, only called for "withdrawal of Israel armed forces from territories occupied in the recent conflict" — but not from "all the territories." The resolution also didn't specify strict adherence to the pre-1967 line, advocating only that "secure and recognized" boundaries be established.
http://www.latimes.com/news/opinion/commentary/la-oe-gold-israel-borders-20110605,0,6320227.story