scmJS docs

Bring

True when the player has at least, at most or exactly the number of units of the type inside the location. A location's elevation settings (which of low, middle and high ground and air it covers) decide which units it counts.

Condition 3 · Bring(Player, Unit, Location, Comparison, Amount);

Argument Takes Stored in the condition
Player a player or group bytes 4–7
Unit a unit type, or one of the unit classes bytes 12–13
Location a location (Anywhere is location 64) bytes 0–3
Comparison At least, At most or Exactly byte 14
Amount a whole number, 0 to 4,294,967,295 bytes 8–11
Bring("Current Player", "Terran Marine", "Beacon", At least, 1);