Let Floyd Help:

If you want to save on ammo, use Floyd, even if a 
second player is not available. Find a hiding 
place, like a crate or a rock, stand behind it and
press START on the second controller to activate 
Floyd (once you have put him together on Tawfret).
Now shoot down your enemies from a safe distance,
without wasting any ammo. Do the same if you want
to take out crates. You can also use Floyd to 
snip n even when you don't have sniper rifle ammo.
When playing with two players, player one can hide
behind a box and zoom in on far away enemies with 
the sniper rifle. Whether player one has a clear 
line of fire or not, Floyd's higher up position
ensures that player two can do the work ñ without
wasting ammo.