memorial service for the war dead
Formal term for a ceremony honoring those who died in war. Often used in official contexts, such as national memorial services.
A memorial service for the war dead is held every year on August 15th.
慰霊祭 is a more general memorial service for the deceased, not limited to war dead. 戦没者追悼式 specifically honors fallen soldiers.
Compound of 戦没者 (war dead) + 追悼式 (memorial service).