Here is a link, yes a clearnace is required as of 1996.
https://www.hrc.army.mil/site/Active/opdistacc/RA/CRA.htm
Since September 30, 1996, public law has required that “no person may receive an original appointment as a commissioned officer in the Regular Army (RA)”. This past October, the 2005 National Defense Authorization Act (NDAA) required all officers on the active duty list to be commissioned RA. As a result, all new officer accessions are being appointed RA as of 1 May 2005. Eligible commissioned officers currently on AD will be automatically converted to RA on/or after Veteran’s Day, 11 November 2005.
RA integration does not apply to Active Guard Reserve (AGR), mobilized, or Extended Active Duty (EAD) officers.
- Phase I starts with the Commissioning sources (ROTC, USMA, OCS and the Special Branches) certifying that new officers meet the requirements to be appointed RA. Under Title 10, this includes the requirement to be a US citizen, hold a SECRET security clearance or higher, and be of good moral character. HRC - Alexandria will publish RA Orders which will allow all newly accessed officers to enter active duty as Regular Army Officers.