Final answer:
The Medal of Honor uses the phrase "For conspicuous gallantry and intrepidity in action..." as the opening in its citation and is the highest U.S. military decoration awarded for valour.
Step-by-step explanation:
The medal that uses the phrase "For conspicuous gallantry and intrepidity in action..." as the opening in its citation is the Medal of Honor. This highest military decoration is awarded to members of the armed forces who distinguish themselves through acts of valour. The Medal of Honor is presented by the President of the United States in the name of the U.S. Congress, which is why it is sometimes referred to as the Congressional Medal of Honor.