Almighty God, kindle, we pray, in every heart the true love of peace, and guide with your wisdom those who take counsel for the nations of the earth, that in tranquillity your dominion may increase until the earth is filled with the knowledge of your love; through Jesus Christ our Lord, who lives and reigns with you, in the unity of the Holy Spirit, one God, now and for ever. Amen. (Collect for Peace, The Book of Common Prayer 1979, page 246)
For information about D-Day see the U.S. Army’s remembrance page.