I'm retired military, so I won't be going to selection. But I enjoy keeping up my fitness and general health. The Ruck Trainer is a fantastic tool to use to improve your fitness and endurance. The frame and straps are current military standard and you can accurately control the weight and comfort, ergo no cargo shifting with body movement, no keeping equipment packed and repacked again and again, etc. This is a great tool that I wish I would have had when I was on active duty! It is perfect for not only walking (legs) but being creative you can work your upper body (shoulders, chest, etc.). Regardless of Service, Branch/MOS, Rank, Age, this is an outstanding piece of kit, especially for someone who works in a ground related military specialty, or wants to work on their hiking endurance. It is very well made, sturdy, functional. I enjoy using it, and highly recommend it for anyone who wants to train and better themselves! Worth every penny! If you're serious about training, this is something you need to use.