LOGISTICS IN CONTESTED ENVIRONMENTS

This report examines the transport and delivery of logistics in contested environments within the context of great-power competition (GPC). Across the Department of Defense (DOD), it is believed that GPC will strain our current supply lines beyond their capacity to maintain required warfighting capability. Current DOD efforts are underway to determine an appropriate range of platforms, platform quantities, and delivery tactics to meet the projected logistics demand in future conflicts. This report explores the effectiveness of various platforms and delivery methods through analysis in developed survivability, circulation, and network optimization models. Among other factors, platforms are discriminated by their radar cross-section (RCS), noise level, speed, cargo capacity, and self-defense capability. To maximize supply delivered and minimize the cost of losses, the results of this analysis indicate preference for utilization of well-defended convoys on supply routes where bulk supply is appropriate and smaller, and widely dispersed assets on shorter, more contested routes with less demand. Sensitivity analysis on these results indicates system survivability can be improved by applying RCS and noise-reduction measures to logistics assets.Director, Warfare Integration (OPNAV N9I)Major, Israel Defence ForcesCivilian, Singapore Technologies Engineering Ltd, SingaporeCommander, Republic of Singapore NavyCommander, United States NavyCaptain, Singapore ArmyLieutenant, United States NavyLieutenant, United States NavyMajor, Republic of Singapore Air ForceCaptain, United States Marine CorpsLieutenant, United States NavyLieutenant, United States NavyLieutenant, United States NavyLieutenant, United States NavyLieutenant, United States NavyCaptain, Singapore ArmyLieutenant Junior Grade, United States NavyCaptain, Singapore ArmyLieutenant Colonel, Republic of Singapore Air ForceApproved for public release. distribution is unlimite

EFFICIENCY AND RESILIENCE TRADE-OFFS FOR ROADWAY INTERSECTION DESIGN IN THE U.S. VIRGIN ISLANDS

In September 2017, two Category-5 hurricanes made indirect hits on the U.S. Virgin Islands (USVI) and devastated local communities. The hurricanes acutely impacted surface roads and supply chains, where access to critical supplies was reduced due to impeded travel through intersections with broken and inoperable traffic signals. In this work, we assessed the possible post-disaster travel time benefits of converting intersections in the USVI into roundabouts. Roundabouts are more robust to disaster impacts because they do not require traffic signals to operate, but may be less efficient for normal traffic conditions. Thus, we studied efficiency-resilience tradeoffs for intersection design and developed a model to compare roundabouts to signalized intersections before and after a disaster. Our results show that roundabouts are unnecessary for intersections with low traffic flows on St. Croix and St. Thomas. However, roundabouts will be more efficient than traffic signals at intersections with high traffic and adjacent supply locations (e.g., shopping malls). At these intersections, roundabouts may also reduce vehicle travel times by upward of 25 minutes after a disaster when traffic lights are inoperable.Major, Israel Defence ForcesApproved for public release. distribution is unlimite