Here's why:
* Collective nouns refer to a group of individuals considered as a single unit.
* A squadron is a group of people (specifically, a military unit of soldiers, ships, or aircraft).
Even though a squadron is made up of multiple individuals, we treat it as a singular entity.
For example:
* The squadron is preparing for deployment. (Singular verb)
* The squadron's pilots are highly trained. (Singular possessive)