BRd 2806(5) mandates that all service operated compressors pass an annual laboratory test. It would appear that not all branches are aware that it is possible to demand a sample cylinder and have this test carried out using service resources.
The policy and standards for breathing gas testing are laid out in JSP 319 Pt2 Vol 1. This also provides the NSN of the Diving Gas Sample Cylinder which is 6830-99-172-2256.
Units who are struggling to demand the cylinder should take a copy of the relevant sections of BRd 2806(5) and JSP 319 to their chain of command to exlain that this is mandated policy. It this is unsuccessful, further advice and guidance can obtained from JSSADC.