In September, 1920, the organization's basic values were drafted, and its constitution was formulated during the first few years. As the organization grew and was suborned to the Jewish institutions and the Zionist movement, it became necessary to redraft the constitution. The need for setting organization principles and values grew once Irgun Bet split from the Hagana. As a result Shaul Me'erov Avigur started revising the constitution in 1934. The final draft of the constitution was finally approved in 1941. During this period of time, the Hagana grew, established a National Command, and acquired significant military experience during the Arab riots of 1920-1921. National Command members Israel Galilee and Shaul Me'erov consulted with leaders and intellectuals, before drafting the final version of the Hagana Codex.

Full version of the Hagana Codex:
The Hagana - National Defense Organization (in short OR).
A. The OR is the military arm of the Jewish people striving for independence in the land of Israel.
B. The OR is subordinate to W.Z.O (World Zionist Organization) and of the Knesset of Israel and obeys their orders.
C. OR assignments:
1. Defense of the Jewish Yishuv against all those who wish to harm Jewish lives, property and honor.
2. Defense of Zionism and the political rights of the Jewish people in the land of Israel.
3. Defense of the land of Israel against all external adversaries - according to political circumstances.
D. OR is the only authorized Defense organization in the Land of Israel.
E. OR will act as a unified national military arm under the command of a central National Command.
F. OR will serve the entire nation, Yishuv and Zionist Movement; the OR flag is the national flag of white and blue, and its anthem the national anthem (Hatiqwa).
G. OR welcomes every Jewish man or woman willing and able to fulfill their civic duty. OR membership is based on every man and woman acknowledging both their right and their duty to volunteer individually and freely.
H. Membership is conditional on absolute military discipline and obedience. OR discipline is based on the member's inner convictions and on a regime of friendship, freedom of expression and equality.
I. The OR is free of non Jewish authority. Its existence, activities and weapons must be kept strictly clandestine, and who ever breaks this rule must be held accountable.
J. The OR teaches its members loyalty to nation and country, the love of freedom and Jewish resistance, courage, how to condition oneself to hardships, the will to sacrifice, cherish human lives, integrity, Maintaining a simple way of life and basic Jewish humanitarian values.

The Hagana insignia
Moshe Bar- Tiqwa- Mundek Pasternack first drew the insignia of the entwined sword & olive leaf on the wall of the Platoon commander training course headquarters, while serving as commander of the course in 1941.
It became the graduates' insignia, and later on, became the Hagana insignia.
The Platoon commander graduate pin was first introduced in a graduation ceremony held in Gymnasia Herzliya in the presence of Hagana Chief of Staff, Ya'acov Dori and head of National Command Moshe Sneh.
When the General Staff National Command was moved to the Red House (Hagana headquarters in Tel-Aviv and in 1948 Palmach headquarters as well), the insignia was stamped on the access permits of those authorized to access 'the red house'.
To this day the same pin is awarded to officer course graduate.
Corps & H.Q. insignias, rank insignias and decoration of merit insignias, all portray the Hagana entwined sword & olive branches.