The primary purpose of this rulemaking is to extend 46 CFR part 4 provisions regarding marine casualty reporting and associated drug testing requirements to foreign vessels, mobile offshore drilling units (MODUs), and floating facilities engaged in Outer Continental Shelf (OCS) activities on the United States OCS. This will ensure the same level of safety is provided to all mariners, floating installations, MODUs, offshore supply vessels, and other vessels operating.  Additionally, to the extent that U.S. flag vessels and MODUs were disadvantaged by being subject to more stringent requirements than foreign flag vessels and MODUs, the rule will level the playing field.  The harmonization of criteria currently found in multiple CFR subparts will simplify requirements, as will raising the property damage dollar threshold reporting requirements for foreign MODUs to align with domestic MODUs.  This will improve the Coast Guard's ability to investigate casualties that occur on the United States OCS. Casualty data is essential to conducting the analysis necessary to develop sound future regulatory requirements. A regulatory safety regime founded on improved casualty information will help prevent future mishaps and make the OCS safer and cleaner for future generations.