Responding to crises at home is part of the Guard’s mission. Helping crack down on crime in U.S. cities isn’t, say some former leaders, who fear this shift could hurt the force.

© Haiyun Jiang/The New York Times

Focusing on a small group of offenders is more effective than sweeping crackdowns.

My city is taking an innovative approach to crime prevention. It does not involve the military.

Many residents are willing to endorse or participate in violent resistance.