Mack, a 6-foot, 205-pound junior, ran for a school-record 1,381 yards last year and led the conference in rushing, averaging 6.6 yards a carry with 13 runs of more than 20 yards.
Walker, a senior with 33 starts, holds school records for TD passes (52) and total offense (8,237 yards), and with 7,374 passing yards, he's 121 short of the school record.
The 5-foot-11, 201-pound Boone (7.2 yards per carry) will be the featured back this season and could be a breakout player as the Bearcats try to recommit to a running game.
Newsome, a 5-foot-7, 180-pound junior, led the AAC with 1,686 all-purpose yards as a sophomore, including two 100-yard rushing performances in the Huskies' final five games.