I have actually done it. Although not severely, I broke my leg in basic training in 1982 and they sent me home on convalescent leave. It was October so I spent most of those days off in a tree bow hunting with my buddies. When Igot back tothe base, my cast was in shreds. The doctors were not pleased and threatened to charge me with damaging US Army property. In those days we didn't have any climbing stands, ladder stands or even tree steps. I was sitting on a 2 x 6 across a two branches. It actually worked out pretty well. I got some free time off during bow season.