In the beginning, SWAT's biggest challenges were simply getting started, followed by what role SWAT would play. Often, the biggest hurdle was what to call teams, since there was often vehement opposition to the name SWAT. The early years were an uphill battle and a study in perseverance and patience. Many SWAT teams were not allowed to form until years later—into the 1980s and beyond—and often still shied away from the term SWAT. This is how so many name variations came to exist.
During my team's early years, we labored under the pressure that a single "mistake" would result in us being disbanded. But that was then, before SWAT became law enforcement's primary response to high-risk incidents. That is, until Columbine and a proliferation of active shooters, when for the first time in 40+ years patrol became primary, with SWAT secondary.
The active shooter track courses I sat in on at TREXPO East indicate active shooter strategy continues to evolve. First arriving officer(s), joined by additional responders, followed by SWAT in a strategy known as multi-tiered response—which utilizes time, tactics, and training to full advantage.
In response to Columbine and the North Hollywood bank shootout, patrol is becoming better armed, equipped, and trained (often by SWAT). All of which combines to improve LE's tactical capability as a whole, as well as draw patrol and SWAT closer together.
Prime examples of such close tactical cooperation include patrol and SWAT in North Hollywood and the Army Rangers and Delta Force in the "Blackhawk Down" incident. When the bullets are flying, everyone's in it together, and the better trained and equipped all good guys are, the better the outcome.