Short tutorial on selecting and feather.
So here's the image I'm going to work with and I'm going to take out the lower left soldier.

Select your lasso tool and change your feather settings to 1 or 2. While holding down, trace around the soldier.

This is what you should end up with after you connect the lasso. Copy and paste your selection.

Select the magic wand and click outside your new layer image. You can disable the background layer for better viewing.

Select Feather from the menu.

Choose 2 or 3, press enter. Then press the delete key on your keyboard a few times or as needed. It will slowly soften the erase around the soldier.

Now if you really want to make it look good, apply the above process by using the lasso tool around the barrel flare, obviously using a new layer as well.