Cool. They must be new, I've never heard either of them.
WIDOW has actually been used since March of 2017. STUKA is new. Someone must've been watching Battle of Britain recently.
These are all the call signs I've heard used this year by the MTC A-10's.
ARCHER. SKID. VADER. BOAR.
ARSON. BANE. GRIZLY. PSYCO.
NASTY. HOWDY 51. RAZOR.
CHAOS, sounds like, TEJAS. GHOST.
MIGGY? or BIGGY? VIKING. WIDOW.
KILLER. MADDOG. FELON. CHILL.
FREEDOM. DRAGON. HUNTER.
COLT.
ARTY 31 lead had aircraft 269, the General was in aircraft 224. They did a flyby over the ramp for the Generals last flight.
TIGER 11 x 4 for Tigers opening day flyby.
They still use the normal call signs sometimes. DEMON, TEJAS, YALTA, BOSON.
Chuck in Detroit / NODAK 1