Martin,
Argentinaīs FAA is looking for planes to enlarge its C130 fleet. Itīs been also upgrading some of the planes it has and itīs been at some point stablished that some 8-10 aircraft are needed.
The USMC planes were looked upon. I know that some five or six were chosen. Wether they are KC or not itīs not relevant since itīs not what the FAA is looking for. Anyway, the sale requires an authorization that will be left for Trumpīs administration to clear or not. And then itīs the eternal matter of payments and delivereance schedules.
Since the retirement of the 707, F-28 and F-27 in the past eight years, the transport fleet of the FAA has gone shrinking.
Most recent news refer to the interest of both FAA and COAN for the C-295. Looks like no less than 4 of those planes could be ordered soon. And the KC-390 itīs also in the FAA plans