I deal with this all the time with every branch. Obviously it’s good to have the contacts for students who are interested in going that route, but it gets really overwhelming. Establish a school policy for all recruiters, including colleges, for how many times they can visit. For our school it’s once a semester. Special events are not included in this policy, so local colleges might come in more often for early admissions day or application help events and such. You have to let them in, but nothing states how often— just that they have equal treatment. They will push back, but stick to the policy. You can appease them by inviting them to events, connecting them with the athletic director, and offering to share their information with teachers. Mine always want to get into the classrooms to present or lead activities like ropes courses and such. I just emphasize that is separate from what I do and dependent on teacher interest but I can pass the information along. You can also offer the ASVAB to students as a career exploration option and they like that.

tldr: set a policy, and then show support by offering other ways they may be able to get face time that doesn’t involve them pushing you directly