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美国加利福尼亚州圣迭哥，美国海军HSM-41打击直升机中队41架“海鹰”直升机列队展示以庆祝连续17万飞行小时没有A级事故。A级事故是指有机组人员丧命，全残，飞机报废或者损失超过100万美元。 （Sailors assigned to Helicopter Maritime Strike Squadron (HSM) 41 stand in formation showcasing 170,000 consecutive flight hours without a Class "A" mishap. Class "A" mishaps are incidents with a fatal injury, total disability, destroyed aircraft or a total cost of more than $1 million.）