Hawk? Nike? F-4? What decade is this? The 1980s?
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That iteration of the NATO Integrated Air Defense Network was centered around massive static instillations and is rather outdated by todays standards which feature rapidly movable short and long-ranged air-defense systems like PATRIOT, NASAMS II and ASTER, integrated air defense naval assets like ESSM and SM-2 and individual air forces from NATO partner nations.
Functionally the air defense network works in a similar manner, but its scope has expanded to include naval assets too, which form a major cog in integrated air defense networks for capable nations like the US, UK, Norway or other Eurofrigate users. It's far more mobile and survivable playing an emphasis on rapid response to all classes of threat. Currently the static defenses of the NATO Integrated Air Defense Network take the form of AEGIS Ashore batteries in Romania (and soon Poland) for defense against strategic missiles. The rest of the network is mobile and designed to work in concert with maneuvering troops on the ground, at sea or in the air seamlessly and without delay.
The TMLD equivalent depends on the system a nation is contributing, such as this MPQ64. They provide the eyes needed to down heloes, UAVs and actually have pretty long ranges (40-75km). Such systems are no longer the first-eyes on target, but are for point or area defense.
AWACS, surface and subsurface boats and land-based long-ranged radars (the Globus II below has a range of +7000km) provide one component of the current sensor package. EW assets also form part of that barrier as do intelligence assets.
Cool thing about these Sindre II radars is that they can be retracted into subterranean caves.
NATO nations do have air defense guns... well some of them do, like Poland which has a handful of 40mm cannons and Russian holdovers, but these types of systems play no large role in the modern NATO Integrated Air Defense Network and assets needed to support them have been phased out.
So yeah, ultimately you're correct there are NATO examples to lend credence to Pakistan's use of AA guns with short-range, low-altitude radars, but that example is also three decades old and needs to be paired with modern solutions to maintain effectiveness on a networked battlefield.
The line formation concept doesn't exist anymore and has been outdated for a while now. Maneuverability and networking, support and cooperability are the go-to capabilities of today's air defense networks in Europe. I hope Pakistan isn't predicating its defense network on a three decade old NATO plan and concept type.
Russia's modern air defense networks might offer a better and more time-relevant example.
Sorry for being nitpicky
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Strela is analogous to Stinger, Mistral or Anza with a range of roughly 4km, not 400km. The OSA missile has a range of about 15km. The OSA vehicle has a range of about 500km... the missile does not.
Both are quality systems and have blood on them, but they aren't strategic air defense assets. More of mobile point or limited area defense.
Let's remember that the ranges are stated for the ideal, picture perfect conditions against a non-maneuvering target that isn't deploying countermeasures. The reality is that none of those things happen on a modern battlefield.
Also, the +400km missile isn't effective against fighter-class targets. It's too big and was designed to down heavy bombers, tankers and AWACS assets (large ones like the E-3, not smaller ones like the E-2D). The missile that has the longest range against fighter class targets has a range of around 250km.
Again, these are deadly missile systems and though they don't have bodies yet, dismissing them is a fools game. They form some of the most well respected, most feared air defense systems on the planet.
For comparison, PAC-2 has a range of about 160km against fighter class targets, and less against missiles.
I like HQ-9 and respect its capabilities too, and the Chinese make a damn good missile, but 40-50 batteries is a lot.
One NASAM II battery has twelve launchers, each with six missiles. The missiles can be AMRAAM-B/C/D, Evolved Sea Sparrow Missile Block I/II, or AIM-9X Block I/II. Note that each missile has a different name when used as a surface-launched weapon, i.e. SL-AMRAAM or SL-AMRAAM-ER.
One PATRIOT battery line has six launchers, each with between 2-16 missiles depending on the type (2-4 for PAC-2, 2-16 for PAC-3).
One HQ-9 battery consists of four launchers, each with four missiles.
Ten might be better - 160 missiles. 40-50 is a tad excessive.