I was on my way to work, (active-duty military), and stopped to get a quick morning workout at a park near the river, since there was no PT scheduled this morning. The area where I stopped is a large parking lot, which adjoins a grassy area near the Riverwalk, and is rather concealed from the road by a shopping strip, and is somewhat isolated. However, it is impossible to approach me without me being aware of it. I had finished my workout and stowed my gear in my SUV, then put my uniform top back on over my t-shirt, and was standing, drinking from my coffee mug, when I saw a single individual approaching me. 5' 10", white or hispanic, late twenties to early thirties, shaved head, goatee, navy blue long sleeve work shirt un-tucked over a dark t-shirt, jeans, work boots, wallet chain on the right. Did an immediate and obvious 360 degree scan, while setting my coffee mug on the hood and putting my right hand on my belt line behind my hip, under the tail of my uniform shirt. Individual came up and tried to engage me in conversation, (the weather, his homelessness, etc). I told him I couldn't help him, while constantly watching his hands and eyes, and after a couple moments he moved on towards the Riverwalk, and as he moved on, he raised his hands and said, "no bad guy here!". That last statement confirmed my suspicions, and as soon as he was far enough away, I got in the truck and de-assed the area. Thoughts?