Normally I'd say this would be Off-topic but I think given the wide varying of SWAT uniforms and people's questions about their tactics and weapons, it should be here.
Some good SWAT Videos showing uniforms and tactics
YouTube - SBPD SWAT
- San Bernadino PD
- Dallas SWAT
YouTube - SWAT VIDEO
- A mix Sheriff and PD
YouTube - SWAT LAPD
Add more if you find some good ones!