Motorized infantry exercise at MUTF featuring Terrex and Leopard 2A4.
Appears Terrex weapons station carries either CIS 50 or CIS AGL + GPMG coax.
BTW when clearing buildings I would not advise to stand in front of the windows. Or at least to aim your weapons inside.
http://www.straitstimes.com/BreakingNews/Singapore/Story/STIStory_674566.html