SOLVED!!!
1. THERE IS NO BUG IN THIS MISSION.
2. NO NEED TO CAPTURE THE CHRONOSPHERE.
3. JUST DESTROY ALL ALLIED UNITS.
4. THE TRICK IS THAT YOU WILL MISS OUT ON EITHER A SHIP HIDDEN UNDER THE BLACKENED AREA OR
5 YOU WILL MISS OUT ON A PILL BOX MACHINE GUN HIDDEN UNDER THE SNOW.
6. THE EASIEST WAY TO LOCATE UNDESTROYED UNITS IS TO FIRST MAKE SURE THERE IS NO BLACKENED CLOUDED AREA LEFT ON THE MAP. SECONDLY CAREFULLY LOOK AT YOUR MINI MAP AND YOU WILL FIND UNDESTROYED ALLIED UNITS HIGHLIGHTED AS BLUE DOTS. YOU WILL THEN CAREFULLY LOOK AT YOUR MAP AND FIND IT.
7. IN MY CASE AFTER GREAT FRUSTRATION I FOUND A HIDDEN PILLBOX NEAR THE CLIFF SIDE RIGHT ABOVE THE CHRONOSPHERE AREA.
8. GOOD LUCK
