I'm told I have to go into the IRR before transferring from the Guard to Reserves. Is this true?

UPDATE: After asking this question to multiple individuals, including this community, I finally have an answer that makes sense and assures me that I'm not being fed a line of BS. My outstanding Bn S-1 did a lot of work on this. So, transferring from the Army National Guard to the Army Reserve can happen both ways: with either a Conditional or Unconditional Release. The Unconditional places you in the IRR. It involves less paperwork, but you have to completely out process the unit before being transferred. The Conditional route usually takes longer and involves more coordination between the two components. Once you are in the IRR, it is basically a unit transfer order for the gaining unit, which is why they prefer that route. Thanks to all of you for your very helpful input. This thread has helped greatly.