A cloud-based Mobile Computing Applications Platform (MCAP) for enhanced situational awareness and mobile command and control for first responders is introduced. MCAP is a cloud-enabled platform for defining, developing, and deploying apps on smartphones, tablets, and in-vehicle computers. Unique differentiators of the approach include the use of COTS technologies for mobile computing and wireless networking to create a low-cost and sustainable program. A platform architecture that exposes a set of reusable mobile core services that fosters an eco-system of partners to develop featurerich and innovative apps is discussed. Core services provide support for location, user profile, notification, authentication, content management, and device management. A public-private collaboration and governance model, an essential element for a healthy eco-system, is outlined. The current status of the MCAP program is presented, including experiences from user trials with several Michigan National Guard units.