This is what i have been able to make within the 72 hours of the tf2maps.net jam. (summer 2016)
In the final version the soldier is suppose to be holding a flag, which then breaks at a specific moment.
For the people who don't understand why it isn't that smooth, that's because i'm using an animation technique where you first mark poses at specific points in time, later on i will connect the dots.
Have a nice day,