Real-life DDD: organise code by responsibility layers

Here is a screenshot from Visual Studio from a project for a client that I have been lead developer on for the past few months. The domain (actually a bounded context within a larger ERP system) is training for an emergency services department, where staff are required to be proficient in all sorts of skills like using rescue equipment and performing first aid. On the left is what the domain layer looked like when we began several months ago. On the right is how it looks today.