Recently ORDed and got posted to A1618 — anyone knows what this unit is?

Hi all, recently ORDed and was previously an OOC from a combat unit before getting posted as an MMI medic during service. I just checked and saw that I’ve been posted to Unit A1618. Does anyone know what this unit is about or what kind of role it usually involves? Also wondering when reservist/call-up might usually start after ORD for this kind of posting. Would appreciate any insights from anyone familiar with it. Thanks!