This is what your $600 should go to if you don’t have these items.
Respirator for when you get tear gassed and pepper sprayed https://www.amazon.com/3M-Respirator-6300-Respiratory-Protection/dp/B007JZ1MK6/ref=mp_s_a_1_3?dchild=1&keywords=respirator&qid=1608254908&refinements=p_85%3A2470955011&rnid=2470954011&rps=1&sr=8-3
The right filters so you can hang in their longer than the rest https://www.amazon.com/3M-Cartridge-60923-Respiratory-Protection/dp/B00AEFCKKY/ref=mp_s_a_1_2_sspa?dchild=1&keywords=respirator&qid=1608254908&refinements=p_85%3A2470955011&rnid=2470954011&rps=1&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyMU8yNlE5TlpFQkMmZW5jcnlwdGVkSWQ9QTAxNTU5NjUzUUpUVzM0NlZNNEtIJmVuY3J5cHRlZEFkSWQ9QTAwNDE0NzEyWjNFNjFCVjkxRkNJJndpZGdldE5hbWU9c3BfcGhvbmVfc2VhcmNoX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=
Bump helmet for batons, bottles, etc. (don’t get shot in the head) https://www.amazon.com/ATAirsoft-Tactical-Helmet-Price-Version/dp/B00ERXWT50/ref=mp_s_a_1_14?dchild=1&keywords=tactical+bump+helmet&qid=1608257611&sr=8-14
Good rucksack for supplies https://www.amazon.com/REEBOW-GEAR-Military-Backpacks-Rucksacks/dp/B01KJMK4W2/ref=mp_s_a_1_3?dchild=1&keywords=tactical+bag&qid=1608253266&refinements=p_85%3A2470955011&rnid=2470954011&rps=1&sr=8-3
Boots for walking (and kicking) (probably better than these) https://www.amazon.com/FREE-SOLDIER-Outdoor-Military-Tactical/dp/B07417JL6X/ref=mp_s_a_1_1_sspa?dchild=1&keywords=tactical%2Bboots&qid=1608253482&refinements=p_85%3A2470955011&rnid=2470954011&rps=1&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExWjRXVElBNERHMEo2JmVuY3J5cHRlZElkPUEwNzQzOTkyMUVOUjhFR1JUNTNQMyZlbmNyeXB0ZWRBZElkPUEwNzAyMDI5UFJHNlZRRFpWNlEmd2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ&th=1
Baofeng radio for communicating with comrades and intercepting enemy comms https://www.amazon.com/Baofeng-UV-5R-Power-3800mAh-Transceiver/dp/B075H7ZMNV/ref=mp_s_a_1_3?dchild=1&keywords=baofeng+uv-5r+8+watt&qid=1608253697&refinements=p_85%3A2470955011&rnid=2470954011&rps=1&sr=8-3
A throat mic to communicate on the fly https://www.amazon.com/Retevis-Earpiece-Acoustic-Headset-Baofeng/dp/B010M3H0CK/ref=mp_s_a_1_3?dchild=1&keywords=baofeng+uv-5r+throat+mic&qid=1608253625&refinements=p_85%3A2470955011&rnid=2470954011&rps=1&sr=8-3
A plate carrier for your plates https://www.ar500armor.com/veritas-lite.html
Level III set of plates and trauma pads (try not to get shot by a 30-06) https://www.ar500armor.com/veritas-lite.html
This is all just over $600 before tax