The United States Navy is trying to replace the C-2 Greyhound with the V-22 Osprey which is the only vehicle to do it 

but there needs to be another vehicle that could help do the job of Carrier onboard delivery and I’m asking Lockheed Martin to  reengineer the S3 Viking anti-submarine warfare aircraft not only for carrier onboard delivery but as an aerial refueling tanker for both manned and unmanned aircraft