The Star of David with a fighting knife and wheat in the upper right-hand corner marks this as the grave of a member of the Haganah (The Defense).
The Haganah were the Jewish paramilitary units, composed of fighting farmers (thus the knife and the wheat).
They defended the kibbutzim on which they lived from Arab attacks during the days of the British Mandate and in the early days of the War for Independence.
Note the bullet-punctured "battle bowler."