SpotterG 5

Spotter G5:
Kill 50 Enemies with an Airstike

This easiest way to get this done post-campaign is using Mission Select: Chapter 2 Mission 14. Kill the 3 foot soldiers south of the starting position and the sniper on the ridge east of the starting position. Purchase Air Strike from the Menu for 24,000 command points. Proceed towards the middle of the buildings northeast of the starting position and let the green foot soldiers mass around the red soldiers. Use one or two air strikes here. Proceed west from here and there will be about 8-10 green foot soldiers all bunched up behind a shot down helicopter (near extraction). One well placed air strike should take them all out. The airstrike takes a bit of time to launch so I would recommend placing it a bit in front of the moving soldiers. Thanks to Brother Reabo for posting this great video . . .

https://www.youtube.com/watch?v=l8uauqHCLDM