In the Boneyard map on the ship, there is a staircase with two flights
that leads from the ground to the ship. This staircase is on the right
side when you are looking at the Elite spawn on Invasion. Walk onto the
upper flight of stairs, and look at the fence keeping you from falling 
off the ship. Jump to the lower part of the fence, and turn to the open
area. Jump onto the part of the ship that hangs over the edge to leave 
the level boundary. If there is only one person on the console and you 
look at the indicator of where you are (bulkheads, under the ship, bridge,
etc.), it will read "out of bounds". This is a very good location to pick 
off the Elites in Invasion with a DMR. *Note:* You can only walk so far 
over before you fall off the ship and die.