The most serious deficiency in NATO's air defence is the lack of an identification system to distinguish friend from foe.

北约防空的最大缺陷就是缺乏能够辨认敌友的识别系统。

《柯林斯英汉双解大词典》

Thales demonstrated its Reverse Identification Friend-or-Foe (IFF) concept at Eurosatory on 18 June: a system designed to eliminate friendly fire during air-to-ground engagements.

2008年6月18日，泰利斯公司在此次欧洲萨托利防务展上展示了其逆向敌我识别(IFF)概念：一种能够消除空对地作战中对友军开火的系统。

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He was also reportedly carrying a fake Air France crew identification card.

BBC: Frenchman 'posing as pilot' found in US jet cockpit

He also was carrying a bad fake of an Air France crew badge and a fake crew identification card, according to police and Air France spokesman Cedric Leurquin.

CNN: Pilot wannabe gets nonstop ride to jail

The National Air Traffic Controllers Association (NATCA) is asking for armed guards and better identification cards at all 325 Federal Aviation Administration controlled facilities.

CNN: Union claims security lax at many air control towers