This is coolbert:
As it is in England so it is too in Belgium.
Those police forces involved in anti-terrorist operations their ranks now bolstered by active duty military personnel.
"Belgium Deploys Troops Alongside Police Amid Increased Terrorist Threat"
"Belgian authorities deployed troops on the streets of the country amid increased terrorist threat.
Anti-Terrorist Operation in Belgium"
"MOSCOW, January 17 (Sputnik) — Belgium has deployed troops alongside police to protect the country amid increased terrorist threat, as more than 20 people were arrested in Belgium, Germany and France in the recent days over suspicion of participating in terrorist activities, the BBC reported Saturday."
I might well imagine those military personnel found amid the ranks of the police carrying some heavy firepower on demand. To counter that other heavy firepower as might be found among the terrorists. Europe once relatively small arms and gun free but now awash with a variety of automatic weapons, rocket propelled grenades and explosives also available to the bad guy.