SY277 Snatch Beach - Boom Beach

What is this SY277 set based from? A movie? A TV series? A book? I haven't heard of Snatch beach. Searching the net comes out the result "SY277 Snatch Beach Island Jones Boom Beach" or "The Movie Snatch Beach Figures Military SWAT Soldier Minifigures Toys with Weapons". There is a Chinese word translated as "Snatch Beach Unique Army". Since their faces are not yellow, hence it cannot be those CITY personnel.
Later on my kid told me its actually a mobile strategy game from Supercell, sort of like COC. It is called BOOM beach. Minifig quite okay, but some do not really match the actual characters. Whats disappointing is the blue soldiers (Rifleman and Medic), they are already quite plain, but SY omits the detail of the Ace card and Medic Cross on the helmets, and Medic suppose to have White helmets.

Warrior, Lt.Hammerman , Grenadier, Heavy
Tank, Zooka, Medic, Rifleman

Tank's hair is same as AOU Black Widow