Well, unless SPARTANS become reality, Earth would be screwed

COVENANT INVASION ALERT; THE COVENANT, AN ARMY OF ALIENS, HAVE INVADED EARTH. THIS IS NOT A TEST. FOLLOW THESE INSTRUCTIONS IN ORDER: GATHER ANY IMPORTANT SUPPLIES SUCH AS CANNED FOOD, WATER, FLASHLIGHTS AND A CRANK BATTERY OPERATED RADIO. BRING ANY PETS AS WELL. IT IS ALSO RECOMMENDED TO HAVE A GUN. THE U.S. MILITARY WILL GUIDE YOU TO THE NEAREST SHELTER.