|Mexican Border Service Medal|
|Awarded by United States military|
|Awarded for||service at the Mexico – United States border|
|Established||9 July 1918|
|First awarded||1 January 1916|
|Last awarded||6 April 1917|
The Mexican Border Service Medal was a decoration of the United States military which was established by an act of the United States Congress on July 9, 1918. The decoration recognizes those military service members who performed military service on the U.S.-Mexico border between the dates of January 1, 1916 and April 6, 1917, a period of time where the US-Mexico border was perceived to be threatened by a suggested German-funded invasion (discovered by the interception of the Zimmermann Telegram).
To be awarded the Mexican Border Service Medal, a service member must have served with the United States Army, along the Mexican border, or must have been assigned as a Regular or National Guard member to the Mexican Border Patrol. Those who had received the Mexican Service Medal were not eligible for the Mexican Border Service Medal.
The Mexican Border Service Medal held dual status as both a Federal award and a decoration of the United States National Guard. The Texas National Guard created a similar decoration, known as the Texas Cavalry Service Medal, and permitted Texas Guardsman to receive both the Border Service and the Cavalry Service Medal for the same period of duty.