Preparations for lethality simulations with Aval (Assessment of Vulnerability And Lethality) has been done as part of an assignment from the Swedish Armed Forces. The overall aim is to generate data supporting near future purchase of new small arms, including munition. A simple model of projectile tumbling in soft materials has been developed as well as modifications in existing computational tools. The American tool ComputerMan was originally developed for fragment penetration injuries in humans. These models are enhanced to also include effects of tumbling projectiles and built in to a project specific version of Aval. This version of Aval will be used in lethality simulations during 2017. Current experimental studies aim to generate input data regarding hit point distributions and penetration performance for different weapons and munitions. Tests indicate that the modified Aval gives identical results as the original ComputerMan, which indicates that the calculations are performed as planned.