These Halftracks were on display at a public day in Zwölfaxing barrack. I do not know if these halftracks were Austrian Army M21.
“M21 Halbkettenfahrzeug” “M21 halftrack” “österreichisches Bundesheer” “Austrian Army” “Museum of Military History Vienna” “Austrian Armed forces”“M21 Halbkettenfahrzeug” “M21 halftrack” “österreichisches Bundesheer” “Austrian Army” “Museum of Military History Vienna” “Austrian Armed forces”“M21 Halbkettenfahrzeug” “M21 halftrack” “österreichisches Bundesheer” “Austrian Army” “Museum of Military History Vienna” “Austrian Armed forces”“M21 Halbkettenfahrzeug” “M21 halftrack” “österreichisches Bundesheer” “Austrian Army” “Museum of Military History Vienna” “Austrian Armed forces”“M21 Halbkettenfahrzeug” “M21 halftrack” “österreichisches Bundesheer” “Austrian Army” “Museum of Military History Vienna” “Austrian Armed forces”“M21 Halbkettenfahrzeug” “M21 halftrack” “österreichisches Bundesheer” “Austrian Army” “Museum of Military History Vienna” “Austrian Armed forces”