My sons play MW2, so they're well well trained in handling sniper attacks. They're also well versed in fending off campers and noob-tubers, in case either of those are #6+ on the list.
I hope they are well stocked with smokes and not stun grenades when the snipers come looking. Lets hope they have cold-blooded pro as a perk too.
Strange that you would pick that one. My school district has experienced a school shooting (with 1 fatality), threats by a crazy hater stockpiling weapons whose plan was foiled by local law enforcement, and a nutjob deliveryman who used a pellet gun to snipe at children waiting for the bus. I hate to say it, but sniper attacks have earned a justifiable place on my list of parental worries.