The National Science Foundation (NSF) Division of Ocean Sciences (OCE) in the Directorate of Geosciences (GEO) has been informed that Lamont-Doherty Earth Observatory, Columbia University, is considering plans to extend operations of the Research Vessel Marcus G. Langseth into the calendar years 2025 and 2026. NSF will accept proposals to use the R/V Langseth in the Atlantic, Gulf of Mexico, and eastern Pacific for the calendar year 2025, and in the Eastern Pacific, western Atlantic, Gulf of Mexico, and Caribbean in 2026.