They advertise with a slogan, "Before Manassas, there was Mexico," and explain in their ad:
"Many Civil War leaders like Lee, Jackson, Bragg, Beauregard, Longstreet, Johnston and soldiers they commanded saw action in the Mexican War."This is to connect the DMWV to Confederate "heritage."
This organization seeks to portray the invasion of Mexico as entirely justified.
Ulysses S. Grant, Union general during the Civil War and later President said about the Mexican American War that it was "one of the most unjust ever waged by a stronger against a weaker nation. It was an instance of a republic following the bad example of European monarchies, in not considering justice in their desire to acquire additional territory."
The mailing address of the DMWV is in Garland, TX. I came across this organization in the last 10 or 15 years. I don't really track them, so I don't know what their real agenda is. However, it is odd that after there being no organization for veterans of the Mexican American war since some time in the early 20th century that they think there needs to be one now.
Also, their triumphalist view of the Mexican American War can do no good for the American Southwest.