No one mentions the fact that the letters for tear gas canisters are printed in blue, and the letters on chemical weapon canisters are printed in yellow to make identifying them quick and accurate. Not to mention canisters of sarin, and any kind of chemical weapon, also have the universal biohazard and poison symbols on them.
Lt. Cmdr. Mic Brumby is with the Royal Australian Navy (RAN), yet he is wearing a US Navy Surface Warfare Officer insignia, which consists of the bow of a ship sailing on water with two swords crossed behind it. The RAN equivalent is the Principle Warfare Officer insignia, which is similar to the USN's Surface Warfare pin, except the RAN version has a crown on top of the ship. Brumby's insignia pin does not feature a crown.