This was Rick's Heritage Flag during the war between The United Slavonic Forces and the Hellish Nationalist Alliance. This was also The flag for the United Slavonic Forces 

-The Three headed eagle means he's Slavic which the main bird is polish and the other heads are serbian and russian 

-Skull and Cross bones means he'll kill anyone that is the enemy.

-The Scythes are he's the son of the Grim Reaper

-The othrodox symbols (Cross, Cresent, and Star) means hes on God's side.

-Black color means no mercy on the enemy