The Army Research Laboratory (ARL), Human Research and Engineering Directorate, (HRED), Simulation and Training Technology Center (STTC) developed a mobile web application for conducting research in applying emerging mobile capabilities to the U.S. Army's Combat Medic curriculum. The mobile application used early Apple iOS devices and their native web browsers to deliver highly interactive training content. It consisted of a web server that delivered the application to mobile devices via Wi-Fi wireless internet connections. Students would play group trivia games or answer questions about emerging medical scenarios that included a visual synthetic casualty. A training effectiveness evaluation was conducted to assess how introducing this system into a program of instruction would improve individual learning outcomes. Lessons learned identified the need to update the application. This paper outlines the challenges and solutions that were addressed in updating the mobile application to take advantage of the strides made in mobile web capabilities. Application server technologies and web client development libraries have matured and become highly capable in terms of visual fidelity and usability. The mobile devices themselves now support multi-core Central Processing Units, Graphic Processing Units for rendering, highly optimized web browsers, and greater resolution screens that sometimes eclipse their desktop counterparts. We will describe our strategy for upgrading the mobile application to take advantage of the new technologies especially with regard to the simulation and visualization of the synthetic casualties in the scenario exercise portion of the mobile application. We will walk through our decision process and describe the lessons learned during the upgrade. We conclude with a set of guidelines for other groups taking on the task of upgrading an older mobile web application to take advantage of the myriad and ever-expanding possibilities that mobile devices afford in delivering important simulation-based curriculum to our warfighter and to education in general.