The New York Giants promoted three assistant coaches on Wednesday, including offensive coordinator Mike Kafka to assistant head coach.The team also promoted secondary coach Jerome Henderson to also be the defensive passing game coordinator and quarterbacks coach Shea Tierney to offensive passing game coordinator.In addition, the Giants added two more to the staff, outside linebackers coach Charlie Bullen and defensive assistant Zak Kuhr.The moves come a day after the Giants hired Shane Bowen as the team’s defensive coordinator and Tim Kelly as tight ends coach.The Giants began their staff overhaul earlier this offseason with the additions of new special teams coordinator Michael Ghobrial, offensive line coach Carmen Bricollo, and running backs coach Joel Thomas.