MAMMOTH-CSO
DEPT OF DEFENSE
About this opportunity
********************************************************************************************************** Update 6/25/2026: MAMMOTH CSO submission date extended to 02 July 2026 at 1300 ET. ********************************************************************************************************* Update 6/16/2026: MAMMOTH CSO submission date extended to 26 June 2026 at 1300 ET. Interested parties must have a TS/SCI clearance as this effort is posted on the classified ARC website. To obtain a classified ARC account, interested parties must contact the ACE IT Helpdesk which can be reached at their secure line 855-4223 or their classified email at ACEHELPDESK@ace.svc.nro.ic.gov. Be sure to include your classified email address in the request as you will not be able to access your classified acc...