This was an alternate take on the War Machine suit for Avengers: Infinity War. Originally the script had called for two different suits for Rhodey, as the first one would have gotten destroyed in the battle in Edinburgh. This design was selected for what was then the Mk 5 suit, and I refined it and took it to a final approved model. The original 'X' shaped chest just didn't translate well into 3-D, so I adapted a bulkier theme from an alternated design sketch.
When the MK5 was ultimately cut from the film, I incorporated the backpack weapons array from this design into the final Mk4.