How can I get access to NIPR?

PV2 (Join to see) sounds like you need to introduce your irresistible force (Your NCO) to their immovable object (Ed Center) get them in the same place and have them work it out. First off, there is no NCO requirement to be on NIPR. You have privates in S1 with access. Then your first line can take you to S6 and apply for access.

Unless something changed since Oct 2016, your CAC card should have the certificates loaded so you can log on to any Army computer. Have you logged into an ed Center common use compute before? How do you do all the JKO mandatory training?

Perhaps your NCO is confused with SIPR or having a dedicated computer.

You are a medic and don't have NIPR access? How do you input patient intake information?

Do you have email access? Do you have a .mil email account? Then you have access to NIPR.

NIPR is simply the military's unclassified computer network. You can access most with your CAC, but some do require further access approvals via your S/J-6. Even then, CACs typically allow guest access to most NIPR networks.