We consider the challenges of achieving reliable multicast in mobile ad hoc networks (MANETs).MANET environ-ments can experience high packet loss rates because of node mobility and wireless signal interference. In addi-tion, they are extremely sensitive to the network load due to the broadcast nature of the shared wireless medium. Thus, in designing a reliable multicast transport protocol, two components are essential - reliability and congestion control. We describe and evaluate the performance of the Reliable Adaptive Lightweight Multicast (RALM) protocol. We show through simulation that when subject to a wide range of network conditions (e.g., traffic load, number of multicast sources, and mobility), RALM achieves reliabil-ity, while exhibiting low end-to-end delay and minimal control overhead compared against those of UDP and SRM.