quark2 – religious zionists in Israel are typically referring to HaRav Avraham Yitzchak Hacohen Kook when they talk about “The Rav”.
HaRav Aharon Lichtenstein was the Rosh Yeshiva of Yeshivat Har Etzion (now retired, one of his sons is now Rosh Yeshiva) and is recognized as a Gadol, but his style is more similar to his father-in-law (straight Lithuanian approach) than Rav Kook’s (which adds a more mystical, almost chasidic outlook).