 In August 2015, it formalized a requirement for the CH-53K, listing the type as a "very high priority" item to enable the service to perform missions only the platform is capable of.Israel's current CH-53 "Yasur" fleet is to remain operational until 2025.The CH-53K is competing with the Boeing CH-47F Chinook for an order of approximately 20 helicopters to replace the IAF's current CH-53 Yasur fleet.