The Twin Sisters are a pair of cannons used by Texas Military Forces during the Texas Revolution. They are among the most famous artillery in Texas military history with the "Come and Take It" cannon starting the revolution at the Battle of Gonzales and the Twin Sisters winning it at the Battle of San Jacinto. The Twin Sisters were also potentially used during the Mexican Invasions of 1842 and American Civil War.

The Texas Military Forces (TXMF) are the principal instrument through which the Texas Military Department (TMD) executes security policy for Texas, which has the second-largest population and border in the United States.