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Ontario Mark 3 Navy (MKIII)

Combat Knife [ 1960 ]

The Mark 3 Navy Knife is utilized exclusively by the United States Navy.

Authored By: Staff Writer | Last Edited: 02/26/2018 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

While the dagger proved critical to assassinations and close-in fighting throughout ancient history, it still served a purpose on the high tech battlefield of today as the "combat knife". The combat knife is the warfighter's last line of defense and can also serve as a personal ally of sorts when attempting to survive apart from his/her squad or Forward Operating Base (FOB). For the United States Navy - and the United States Navy SEALs for that matter - the Ontario Mark 3 Navy (MKIII) combat knife fulfills this purpose (it is also known by the name of "Ka-Bar"). The Mark III - in its current form - has been in US military service for over 50 years and is American-made by the Ontario Knife Company of New York - in business since 1889.

The heart and soul of the Mark 3 is its fixed 6.5-inch blade which is designed to stab, slash and cut. The main edge and clip edge are plain while the spine sports a series of saw-like teeth. The two edges meet at a defined point at the tip of the blade which is capable of easily managing canvas or even leather. The blade is manufactured of 440A stainless steel with a black oxide finish so as to not showcase any glint. The grip handle is well patterned for a sure hold and, like the included sheath, is of a molded high impact plastic. The handle also sports a flat face for smashing. A short strap can be affixed to the base of the handle through a provided loop. Construction is such that the knife may very well last a long time, if not outliving its owner, and - due to its intended use at sea and underwater - is specifically engineered from materials that will not suffer from the corrosive effects of the sea. Overall length is 10.75-inches with the blade being of .165" thickness.

Beyond its expected uses, the Mark III can prove a soldier's best friend when used as an ad hoc mallet, anchor or prying tool...essentially limited only to the imagination and circumstances at hand - though within reason of course.©MilitaryFactory.com
Note: The above text is EXCLUSIVE to the site www.MilitaryFactory.com. It is the product of many hours of research and work made possible with the help of contributors, veterans, insiders, and topic specialists. If you happen upon this text anywhere else on the internet or in print, please let us know at MilitaryFactory AT gmail DOT com so that we may take appropriate action against the offender / offending site and continue to protect this original work.


Service Year

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United States


Combat Knife

Ontario Knife Company - USA
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Special Forces
Qualities of this weapon have shown its value to Special Forces elements requiring a versatile, reliable solution for the rigors of special assignments.

Overall Length
273 mm
10.75 in
Empty Wgt
0.62 lb
0.28 kg

Not Applicable



(Material presented above is for historical and entertainment value and should not be construed as usable for hardware restoration, maintenance, or general operation - always consult official manufacturer sources for such information)


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Rounds / Feed

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Cartridge relative size chart
*May not represent an exhuastive list; calibers are model-specific dependent, always consult official manufacturer sources.
**Graphics not to actual size; not all cartridges may be represented visually; graphics intended for general reference only.
Ontario Mark 3 Navy (MKIII) - Base Series Designation.

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Images Gallery

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Image of the Ontario Mark 3 Navy (MKIII)
Close up view of the Ontario Mark III Navy Knife with sheath


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