[17th Miss Regt]

Looks like an M-114 track.

[DMZFrank]

It is from the family of M-113 armored personnel carriers, either an converted M-113 or a modified M-578 command track.

[alfa6]

That is an M-577 variant of the old M-113 APC. The 577 was used for command posts and HQs for the self propelled arty units.

Regards

alfa6 ;>}