Which of these famous military product failures was nicknamed 'The Widowmaker' due to its dangerous design flaws that caused numerous pilot deaths during the Vietnam War era?

Throughout military history, countless weapons and combat systems were designed with high expectations, only to fail spectacularly in the field. These product failures often cost millions in development, resulted in strategic disadvantages, and sometimes even endangered the soldiers who relied on them. This poll tests your knowledge about infamous military equipment failures that shaped procurement and development policies for generations to come.

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M16 Rifle (early version)
F-104 Starfighter aircraft
Mark 14 torpedo
M551 Sheridan light tank