Watch these videos it may improve your skills: http://www.youtube.com/watch?v=elMGVXkaNrg
http://www.youtube.com/watch?v=1DXslqTU6rM
http://www.youtube.com/watch?v=AsTkYjoKVCY
http://www.youtube.com/watch?v=5dlNnL42Lj4
http://www.youtube.com/watch?v=lZPaOsLRu4s
and this one as you may be needed as a gunner
http://www.youtube.com/watch?v=WhVsr_rmTAU&feature=mfu_in_order&list=UL