I summarized the continuous unbroken existence of the ranger battalion assessment and selection programs. All the assessment selection programs have evolved and become more sophisticated since they were first established. It's just a matter of how thoroughly the origins and evolution from the origins and continuous existence to now have been captured in archived documents.
The 75th Ranger Regiment history on certain matters as far as training, qualifications, assessment and selection and SQIs is quite interesting. Even the RASP II seems to be evolving since it was implemented.
For example, the Ranger SQIs are 'G' -Ranger, 'V'-Ranger Parachutist, and 'U' 75th Ranger Regiment Leader (est. July 2011). All assigned to the 75th Ranger Regiments regardless of MOS are SQI V and as of July 2011 there is also the SQI U 75th Ranger Regiment Leader that is exclusive to the 75th Ranger regiment and restricted to any MOS in the grade Sergeant thru Command Sergeant Major.
The five specific eligibility requisites for award of the 'U' SQI are: (1) possess SQI V as a perquisite, (2) complete the Ranger Assessment and Selection Program (RASP) I or II, (3) complete the Small Unit Ranger Tactics Course (SURT), (4) must complete a minimum of 12 months operational experience within the 75th Ranger Regiment, and (5) be recommended by the first Lieutenant Colonel (LTC) in the Soldiers chain of command.
Any how regardless of the program being discussed it's very fascinating history.