Hi Dave
The identification of type is not an issue for most, given the investment that the USAF is making and has made in it's RTLS (Real Time Location System) and other RFID (Radio Frequency Identification). I would expect that it is only a matter of time before this becomes a significant problem for spotters.
The official line is;
AMC Announces
Air Mobility Command has directed its refuelling and cargo planes to obscure the majority of identifying information painted on the aircraft, citing national security concerns an unusual move that is alarming to government watchdogs. (Published by Military,com 01/03/2023)
The list of units covered by the directive are as far as I'm aware - although some listed below may not have aircraft on strength.
AIR BASE WINGS
87th Air Base Wing | Joint Base Mcguire-Dix-Lakehurst, New Jersey
628th Air Base Wing | Joint Base Charleston, South Carolina
AIR MOBILITY WINGS AND GROUPS
43rd Air Mobility Group | Pope Army Airfield, North Carolina
60th Air Mobility Wing | Travis Air Force Base, California
305th Air Mobility Wing | Joint Base Mcguire-Dix-Lakehurst, New Jersey
375th Air Mobility Wing | Scott Air Force Base, Illinois
AIR MOBILITY OPERATIONS WINGS
515th Air Mobility Operations Wing | Joint Base Pearl Harbor-Hickam, Hawaii
521st Air Mobility Operations Wing | Ramstein Air Base, Germany
AIRLIFT WINGS
19th Airlift Wing | Little Rock Air Force Base, Arkansas
62nd Airlift Wing | Joint Base Lewis-Mcchord, Washington
89th Airlift Wing | Joint Base Andrews, Maryland
317th Airlift Wing | Dyess Air Force Base, Texas
436th Airlift Wing | Dover Air Force Base, Delaware
437th Airlift Wing | Joint Base Charleston, South Carolina
AIR REFUELING WINGS
6th Air Refueling Wing | Macdill Air Force Base, Florida
22nd Air Refueling Wing | Mcconnell Air Force Base, Kansas
92nd Air Refueling Wing | Fairchild Air Force Base, Washington
NUMBERED AIR FORCE
18th Air Force | Scott Air Force Base, Illinois
The list of types operated by the above units is quite extensive, but I dont have knowledge of them all although Im putting the list together. But it does include some aircraft from the following types KC-46, KC-135, KC-10, VC-135, V-22, C-20, C-21, C-32, C-37, C-5, C-130, C-17 probably some others. But it should be noted that at the moment, the removal of visible identification marks applies only to Air Mobility Command aircraft that of course could change.
Already reported by spotters as being used without any visible marks are, the following types KC-46, KC-135, V-22, C-32, C-37 and C-130.
Regards
Gull04