Puzzle #87: Line of Sight

I know my production has faultered a bit since the holidays. It's been a bit of a busy period. I'm now going to try to post 3 puzzles per week. One on Tuesday, one on Thursday and one in the weekend.
I'm starting this off with a Line of Sight puzzle. It's still a genre I really like. I tried to incorporate some standard tricks that show up in these puzzles. I think it worked out nicely and I especially like how it finishes.

Rules for Line of Sight