The study takes a comprehensive look at the reasons behind the recent Army decision to transfer the Stryker from contractor logistics support (CLS) to organic (Soldier) sustainment support. Using a case study approach with the Stryker, the thesis discusses the challenges with PBL and CLS. Specifically it addresses: funding integration, culture change, stovepipes in supply and maintenance activities, and government access to technical and demand data. The study also takes a look at the challenges associated with the transition to organic support and explores the notion of an organic PBL. The study takes on the issue of PBL being DOD's preferred sustainment strategy, and how it appears to be in direct conflict with the Army's recent sustainment decisions for Stryker. The research identifies the benefits, challenges, and lessons learned from the Stryker CLS support strategy, so that the Army can apply them to other PBL arrangements in the future. Both primary and secondary data were obtained and analyzed for this thesis. Primary data was obtained through questioning experts engaged in Stryker PBL/CLS activities in different agencies throughout the Army. Secondary data was obtained from previous studies, issued policy, and published guidebooks on PBL implementation.