The Special Forces colonel who had approved a 2017 mission in Niger, in which four U.S. troops from the 3rd Special Forces Group were killed in action, has been permanently removed from the promotion list to Brigadier General.

Col. Bradley D. Moses was in charge of the 3rd SFG in October 2017 when his troops were ambushed while on an operation in a remote part of Niger. Moses was nominated earlier in the year to become a brigadier general after a tour in Afghanistan, but in March, his name was temporarily removed at the request of the Senate.

Army Secretary Ryan D. McCarthy notified the Senate Armed Services Committee on Friday that Moses’s nomination for brigadier general was being withdrawn. An Army spokeswoman declined to comment on the report and said the service does not comment on nominations being considered by the Senate.

Operational Detachment Alpha (ODA) 3212 was stationed at Quallam in Niger when it was tasked with a mission whose parameters kept changing. The detachment commander, CPT Michael Perozeni, asked for permission to return to base due to a lack of usable intelligence, a non-existent air support element for wounded troops, and a chain of command that was micromanaging the operation from far away. The request to return to base was denied by LTC David Painter, the Battalion Commander; Moses, the Group Commander, seconded Painter’s denial.