What organization is responsible for public works at Navy and Marine Corps expeditionary forward operating forces?

The organization responsible for public works at Navy and Marine Corps expeditionary forward operating forces is the Naval Mobile Construction Battalion (NMCB), which is often associated with the Seabees. Specifically, the acronym PHIBCB stands for "Naval Amphibious Construction Battalion," which indeed plays a vital role in supporting these types of operations, primarily focusing on construction and public works in expeditionary environments.

The PHIBCB is instrumental in providing essential services such as planning, designing, and constructing facilities in support of naval operations and marine forces. They are equipped to handle rapid construction and infrastructure support, which are crucial in forward operating scenarios.

While other organizations listed may have roles related to public works or construction within broader contexts, PHIBCB is tailored specifically to the needs of forward operating forces in expeditionary engagements, making it the most relevant choice for this question.