I am not LE, but I have also been looking for duty (Retention level II, perhaps?) holsters for XD Tactical 5". They are very hard to come by. I would go to the Blackhawk site and find one that way.
Anything XD should fit the XDm. You won't find XDm duty holsters and you certainly won't find anything particularly for the new 5.25" XDm. Best of luck. Tell us when you get lucky!
.45acp, .40 S&W, 9mm, .38 Spl, .380 acp, 22lr
12 gauge, .223/5.56x45mm, 30-30 Winchester
2 Chron. 7:14 Christians must seek His face