Cejay Engineering and the Phoenix Jr. with the water/air-tight Poseidon option is featured in the short sidebar article "Team member marker & identifier" in the February, 2010 issue of Law Enforcement Product News. Here is a brief excerpt from that article:

IR Marking Beacons can be a major asset/identifier for SWAT and tactical units in low light environments - any team using night vision devices should be considering their employment - by attaching a Phoenix Junior or similar Infrared Beacon to all tactical team member's; perimeter personnel and overwatch/snipers will more easily identify SWAT team personnel during tactical events from a distance through night vision devices.

You can find Cejay Engineering in the February, 2010 issue of Law Enforcement Product News on page 8.