Gigs don't exist for you to make a decent living
But we got three illegal wars that you can pick from
The three illegal wars he is referring to are most likely Iraq, Libya, and Afghanistan. The United States has been heavily involved with deploying troops in these countries over the last decade and so if you enlisted in the military you would end up being a part of one of these wars.
To help improve the meaning of these lyrics, visit “Only Life I Know” by Brother Ali Lyrics and leave a comment on the lyrics box