2014年6月11日，美国加利福尼亚州彭德尔顿营，美国海军陆战队第4侦察大队使用 CH-46E“海上骑士”直升机进行特种巡逻渗透（SPIE）练习。这一源自越南丛林环境下的战术，适应于不允许直升机降落的情况下快速搭载或卸载侦察分队。（Marines with Company C, 4th Reconnaissance Battalion follow the CH-46E helicopter while it takes off as they perform a Special Patrol Insertion/Extraction system exercise during Integrated Training Exercise 4-14 June 10, 2014. The SPIE system was often practiced and sometimes used during the Vietnam era. The procedure became less commonly used after the war but is again becoming a skill for reconnaissance Marines to use. The system was developed as a means to quickly insert or extract a recon patrol from an area that would be very difficult for a helicopter to land. ITX employs assets from ground, air and logistics combat elements to demonstrate the ability to deploy rapidly and build up significant combat power necessary to form a MAGTF.）