Manager in Training, Retail Management Trainee, Assistant Store Manager, Store Manager in Training, Retail Supervisor, Thrift Store Management, Nonprofit Retail Jobs, Leadership Development Program, Retail Manager Jobs, The Salvation Army Jobs, ARC Program, Full-Time Management Jobs, Kansas City MO Jobs . The Manager-in-Training (MIT) role is designed to prepare candidates to become Store Managers (Level I) through hands-on training, leadership development, and structured performance evaluations.