That conditional release from the IRR is a specific beast, and the DA 4187 can feel like a maze. From my experience, the "Remarks" section is where you clearly state your request: "Request conditional release from Individual Ready Reserve to enlist in [branch/service]." Be direct and include the regulation that authorizes the release, like AR 135-91. Section III is critical - you'll select "Other" and specify "Conditional Release" in the explanation block. The boxes to leave empty are Section V; that's for the approval authority. I've found it helpful to draft everything using a fillable tool like https://pdfguru.com/forms/da-4187-form so I can see the full layout and ensure no section is missed. Always attach a memorandum from the gaining command expressing their intent to accept you, as this strengthens your case. The routing process can be slow, so follow up regularly with your personnel office to avoid losing your packet in the shuffle.