I am 5'5.75" (rounded to 5'6" at MEPS). I have been getting anywhere from slightly shy of 28" to 29.5" for Thumb Tip Reach depending on how it is measured if the shoulder is flush against the back wall or not.I had to put my whole shoulder against the back wall but the officer taking my measurement held my shoulder back and let me stretch so my shoulder was off the wall a bit. How tall are you? I have T. rex arms and I passed so I wouldn’t worry about it