This report describes the work carried out in the project Combined Arms Assessment, which is a part of the Swedish Armed Forces research programme Weapons and Protection. The project duration is three years starting 2020, and this report is a summary of work and results produced during the second year. The main goal of the project is to develop methods and tools in order to study, analyse and assess the explicit or implicit contribution of different weapon systems to combat effectiveness; applied to both existing operational and future weapon system concepts. The project has worked on assessment and simulation of indirect fire effects, a concept for future loitering munition and modelling of air defence guns.