to be
a - DEA
b - Green Beret
c - Ranger
d - Seal
e - Texas Ranger
f - Recon Marine
g - PMC making millions
h - U.S. Marshal
i - Night Stalker
j - Psy Ops
k - go exotic and claim something Russian - interior decorator
I would go with d or e, but because of Miami Vice, a is also a legitimate answer.