From a purely cold-hearted military perspective, in any operation or even in war the objectives are the only things that matter. Let me give you a hypothetical example. Imagine if Ukraine managed to kill Putin and everyone around him and then kill half the Russian population but the war ends here with Ukrainian soil still under Russian occupation. You would obviously say that Ukraine has lost the war because the only objective that matters is liberation of their soil. The rest is not going to change anything if they can't do that.
So lets ask the question of what does the US regime seek? About 20 years ago the retired United States Army officer, general Wesley Clark told us that US regime wants to destroy 7 countries in 5 years. So basically the objective they seek is to turn Iran into Syria, Libya, Afghanistan, Iraq, and the list goes on sadly! aka the countries they've destroyed for no reason.
But they can't do that because unlike those countries the Iran's military is massive, highly advanced and very strong. So they need to do something to fix that. Hence the recent desperate attempt!
In short the objective was to first cripple the Iranian military, carry out a large scale SEAD operation (suppressing air defense) and then follow that up with the largest bombardment of all infrastructure Iran has, civilian or otherwise and slaughter millions of people just like they did in for example Iraq (remember the Iraq has WMDs bullshit?).
So back to the question;
Why was the June 13, 2025 terrorist attacks in Iran a miserable failure for US regime?It's very simple, they couldn't reach any of their objectives. I'll give you two reasons.
1. The title says it all. The first reason is simple and short. From a military perspective carrying out terrorist attacks against civilians has absolutely no value for the enemy that carries out those attacks.
For Iran on the other hand it "unlocks" certain things. When US regime and its regional proxy Israel, attacked residential areas in Iran, it was crossing a red line. The thing about red lines is that when they are crossed by the enemy, they cease to exist.
Now let me introduce you to Tel-Aviv from last night:

Very high value targets that could not be hit in Operation True Promise
1 and
2, could now be hit legitimately.
In this short video you can clearly see the defense battery that was hit:
https://x.com/HossamShabat/status/1933615083168366642#m and
https://www.aparat.com/v/wcufz5mThere are lots of other targets that were destroyed last night, like the Genocide ministry that is located in the middle of Tel-Aviv. And a dozen other high value military targets that could now be hit hard and legitimately.
(BTW the Iranian anti-radiation missile you saw in the video above was used to destroy a large portion of the NATO air defenses inside Israel. The destruction is so heavy that Trumps war minister recently announced that they are pulling air defense from Ukraine to bring to Israel!)
2. They played a hand they could only play once and the damage was minimalUS regime has been training and arming various terrorist groups for decades. Al-Qaeda, Israel and ISIS are the 3 most known ones. But the ones that are less known are Jeish-al-Zulm, MEK, some fractions of Taliban, ISIS-k and some more that US regime activated ever since yesterday.
It takes a lot of resources to train these terrorists, specially to train them to carry out an operation like what you see in above screenshot released by Israeli terrorists using advanced equipment and all that.
Basically the tactic US regime used in this act of war against Iran was this:
A. Using its terrorist groups to enter Iran and build sleeper cells while smuggling "micro drones" (mostly known as FPV) and other shoulder launched missiles like Spike. Then use them to launch a massive scale attack across Iran against civilian and military targets to first create chaos and distraction and second to overwhelm Iran's defensive capabilities to increase the success rate of the second step below...
B. Carry out SEAD operation from 200+ km outside Iranian borders using their air-force to destroy the already overwhelmed Iranian air defenses. Then move inward destroying more defenses and increasing bombardments and finally bring in the "big guns" and slaughter millions of civilians like what they did in Iraq.
Part of the reason why the US regime failed miserably here is because the idiots in Washington are extremely delusional! For example they thought they could kill over a hundred Iranian commanders and by doing that cripple Iran's military.
Apart from the fact that they only managed to kill a handful and they were immediately replaced, this plan itself is extremely delusional and dumb because if anybody with half a brain had ever bothered to watch any of the previous Iranian military exercises held annually they'd have realized the scenario that is usually run is a worse case scenario where there is no commander at all (thousands of commanders killed! each commander has at least 3-4 replacements) and each unit has to continue operating.
Another reason is that these idiots don't have any understanding of how massive Iran's defense system is! The enemy needs tens of thousands of missiles to begin doing meaningful damage.
This is why we saw the Iranian defenses which is by far the largest and most sophisticated layered air defense in the whole world be overwhelmed and damaged in this surprised terrorist attack but it quickly recovered and came back online dealing heavy damage to the US-Zionist axis air-force (so far 3 confirmed F-35 destruction is recorded which is the first time in history).
To put that in numbers, more than 950 projectiles were launched at Iran in the first 24 hours.
~300 air launched missiles from US-Zionist axis air-force from 200+ km outside Iranian borders; majority of which were intercepted with only a tiny portion passing through dealing very minimal damage (these missiles are light so that the aircraft can carry a couple of them, and also to increase their range therefore their damage is minimal).
~650 drones launched from inside Iran by the terrorist cells (usually MEK which is based in Albania) which is what hit the residential areas killing civilians and hit some radars, defense batteries, etc. which again do little damage since these are tiny drones carrying light explosives.
All of this did indeed damage Iran's military capabilities but overall the damage was very minimal. The reason is simple, ever since 1980's during the first US proxy war against Iran (using the Iraqi dictator and US regime ally, Saddam) the "passive defense" doctrine was invented in Iran. I don't want to make this any longer than this (ask me to explain it more in another comment if you like) so lets just say it meant building underground cities. An example to give you an idea:
https://www.aparat.com/v/dch857pThese are not just missile cities, it is airbases, defense batteries, even naval cities under ground. Bulk of Iran's capabilities are deep underground, usually built under the mountains. Such silly light attacks cannot damage any of them. And here is the scarier news for the enemies: even nukes can't damage them...
This is why we saw Iran's air defense quickly come back online and intercept supermajority of those projectiles and later that day we saw Iran easily launched hundreds of missiles in 5 waves each in matter of minutes, many of them from the same exact bases the Zionists claimed they had "destroyed"!
This was a card they could play once! These terrorists don't grow on trees. The US regime has to spend millions of dollars of American taxpayers money to train them. When these terrorist cells carried out their first attacks, the security forces quickly started seeking them out and a large number of them have already been captured and their cell neutralized. Even though they are not all neutralized but what I said is evident from the significant decrease in number of these terrorist attacks.
Now on the other hand, Iran can carry out missile and drone strikes (with heavy warheads like 2000 kg) on any target anywhere in the world all day long for years after years without even running out what already exists in its reserves inside those missile cities!
For example ever since yesterday afternoon Israel is under almost constant bombardment that is not going to end anytime soon.

From op. True Promise.
We have to see if the US regime has anything else up its metaphorical sleeve to turn the tide! So far in this phase, US regime faced a miserable defeat.