(Commentary by U.S. Army Maj. Katie Hillegass, an assistant professor of military science at the University of Virginia) In February, Brazilian President Michel Temer placed the country’s military in charge of security for the state of Rio de Janeiro. The move marked the culmination of a decade-long expansion of the military’s role in internal politics and security. To date, the military intervention has been constitutional, legally sanctioned, and well-intentioned on the part of the military leadership. However, the use of the military for internal security is not a good practice for the mili...