What action regarding the US flag used in a military funeral service is considered improper?

Lowering the U.S. flag into the grave with the deceased veteran is considered improper because it violates the flag's designated respect and ceremonial usages outlined by the U.S. Flag Code. The Flag Code emphasizes that the flag should be treated with dignity and should never be allowed to touch the ground or be disposed of improperly. This action is seen as disrespectful to the symbolism and significance of the flag, as it represents the nation's ideals and the sacrifices of those who have served.

In contrast, the other actions listed maintain the integrity and honor of the flag. Holding it waist high during volleys and taps is acceptable as it shows respect during military honors. Placing the flag on the casket with the blue field over the veteran's left shoulder properly honors the deceased veteran, indicating their service and sacrifice. Folding and presenting the flag to the next of kin is a traditional and respectful gesture, symbolizing gratitude for the veteran's service and the nation’s mourning.