My Mike LB calls out the strong side and motion direction so D-line knows what they are doing and what the other LBers should be doing during that play, we run a 3-3-5/6-2/5-3 and a 4-4. 5th and 6th grade team but they all call out pass pass pass/ball ball ball but yes its usually me screaming reverse. In the case of zone coverage my safety will call out tight or lose depending on his position and a read of the offensive set(but i will most likely tell(yell) the S and cover guys.)