inf VI

"The card states that Samethini was attached to the VI Infantry (battalion?). Can anyone tell me about this KNIL unit and its deployments? Did these soldiers fight in the defense of Malang?"

Inf VI is shorthand for 6th infantry batallion. This unit was deployed at Balikpapan (Borneo) for the defense of the oil installations. As Malang (Java) was never attacked there is not something one could call "a fight for the defense of" it.