Petty Officer 3rd Class Tilford Breedlove, aviation boatswain’s mate and Petty Officer 1st Class Joe Flores, aviation boatswain’s mate, wear a Joint Service Mask Leak Tester to check the integrity of their newly issued gas masks aboard the aircraft carrier USS Ronald Reagan. The JSMLT head tent fills with mineral oil mist while the user does a series of 5 different breathing exercises over the course of twelve minutes. Ronald Reagan is currently in a Compressed Incremental Availability period while moored in its home port of San Diego.