Smoke Dischargers, And Fragmentation Grenades Fired From These

[Griefbringer]

I would presume that most modern tankers would prefer keeping some distance to enemy infantry, thus limiting need for such close defense systems. Also, if you are operating in close proximity to friendly infantry (eg. providing close support in urban environment) such systems could result in friendly casualties.

On the other hand, with prominent access to LAWs, RPGs etc. modern infantrymen have less interest in close assaulting vehicles than their WWII predecessors.