In military terms, how long is a "click"?

A click is a kilometer.

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2 explanations:

#1

1 meter = 39.+ inches, call it 40"

1,000 meters = 4,000 inches = 1 KILOmeter

1 KILOmeter = 1 Klick or click (either)

R-o-u-g-h-l-y, 3K (kilometers) = 2 miles... not really, it's closer with 9K = 7 miles (36,000 feet vs 37,000 feet) but 3-to-2 is close enough for most purposes, other than for hand grenades, arty rounds and laser-guided bombs!

#2:

On sniper rifles, there are 2 knobs on the 'scope: the knob on top can be turned to compensate for windage deflection; and the knob on the side can be turned to account for the bullet's "drop" due to gravity on its way down-range.

Those 'scopes have knobs that 'click' each time they are turned a very small distance. Snipers usually work with a second team member, The Spotter. The spotter uses a 40+ power spotting-scope to 'read' the conditions down-range and conditions between the target and The Shooter.

The Spotter will call out his findings (even if it's as a whisper) to The Shooter. Since The Rifle is the 3rd member of the team, it has been 'zeroed' at a certain distance under certain conditions. After making adjustments to the 'scope for a particular shot, after the shot is taken, the 'scope should then be returned to its original setting, the "Known Entity" or base-line setting. They will write down ALL of the knowable facts about the circumstances of their tracking, camouflaging, waiting, target acquisition and disposal, and their exit.

The point: Each "1-minute-of-arc-" adjustment on the scope equals one 'click' on the 'scope knob/s. So, The Spotter might say "2 clicks left, 1 click up" so that The Shooter can hit The target. The knobs have a definite 'click' sound AND FEEL, so that the shooter knows that each delicate adjustment is 'set' even against the recoil of the fired weapon. Usually after their windage/elevation adjustments to the 'scope's knobs, they will replace adjust cap so that the knobs cannot accidentally be changed by a stray movement or rough handling, etc.

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Farsi or any other Arabic tongues would be really good options. Not only for the current conflict, but for the numerous bases and military interests that we'll have there for decades to come after this thing is finally over. Crypto-tech interpreters and translator and intel specialties all need personnel trained in various languages. My only additional advice would be to make sure you study and train for the military language testing exam. It really is not like anything you will find elsewhere, so you need to hone and bone up for that consistently for at least a couple of months. If you can't be consistent, then purchase a copy of the some of software programs ripped from the military testing method about a year out and go through it at least an hour each week. .

1 kilometer

it is 1 kilometer or 1000 meters

1 Kilometer. I have also heard it used (incorrectly) as a unit of time meaning 1 second.

If you were to spell it our it would also be with a "k"

it's 2 klicks down the road, not 2 clicks.

i kilometer, in the military we use the metric system when we reference to land navigation...well most of the army does...

one click is 1000 meters

kilometer