From the Document: "On January 31, 2020, the Department of Defense (DOD) announced a new policy regarding the use of antipersonnel landmines (APL). According to a January 31, 2020, DOD memorandum, President Trump 'decided to cancel Presidential Policy Directive-37 (PPD-37),' which was issued by the Obama Administration in January 2016. The Administration adopted the new policy following an internal DOD review ordered by former Secretary of Defense James Mattis that was completed in 2018."
CRS In Focus, IF11440
Congressional Research Service: https://crsreports.congress.gov/