The navies of the US and Canada have started a Task Group Exercise (TGEX) off the coast of Southern California.
The US Navy units involved in the exercise are Commander, Expeditionary Strike Group (ESG) 3, Commander, Amphibious Squadron (CPR) 1, amphibious assault ship USS Boxer (LHD 4), amphibious transport dock ship USS New Orleans (LPD 18), and dock landing ship USS Harpers Ferry (LSD 49).
The Canadian Navy unit includes Canadian Fleet Pacific, Halifax-class frigates HMCS Calgary (FFH 335) and HMCS Vancouver (FFH 331), and Victoria-class submarine HMCS Chicoutimi (SSK 879).
HMCS Calgary commanding officer Commander Julian Elbourne said: "The Royal Canadian Navy frequently participates in training exercises such as this with the US in order to provide mutually beneficial realistic and relevant training which is necessary for the proper integration of units from various nations to work as a cohesive task group.
"We look forward to this exercise in order to continue to build our proficiency as allies."
The exercise is aimed at training in amphibious warfare, air defense, anti-submarine warfare, surface warfare, and maritime interdiction operations.
Moreover, it also intended to create a strong working relationship between the maritime forces of the US and Canada.
CPR 1 captain Keith Moore said: "We are excited to have the opportunity to work with the Royal Canadian Navy.
"Operating with our (Canadian) counterparts during this exercise will facilitate a quicker and smoother integration into the coalition environment during our upcoming deployment."
The US Navy recently completed the naval exercise Malabar 2015 with the navies of India and Japan in the Bay of Bengal.