Analytical Report — Erosion & Death of the Islamic Regime
Day 29 of the War | 28 March 2026
Regime Death Index (RDI)
55.8%
90% CI: [52.2% — 58.9%] | Change: +0.3
50.9%
MCI
72.0%
GFI
9.2
To Threshold
×0.75
ISAF
RDI Overview
Erosion Gauge
29-Day RDI Trend
Strategic Space, Day 29
Key development: Houthis entered the war. This is the biggest strategic shift since Khamenei's assassination on Day 1. Houthi entry not only opens a new front but threatens Saudi Arabia's alternative oil export route through the Red Sea — meaning both Hormuz and Bab el-Mandeb could be closed.
Simultaneously, Iran fired 6 ballistic missiles and 29 drones at Prince Sultan Air Base, wounding 15+ US service members. The IDF announced it has targeted ~70% of Iran's military industry and will reach ~90% soon. Vance: 'vast majority of military objectives accomplished' and war continues 'a little while longer.' Trump sharply criticized NATO.
Distance to collapse threshold: 9.2 points. Houthi entry is a 'potential accelerator' but hasn't yet become a 'shock' — its impact depends on the scale of their operations.
Key Events, 28 March 2026
1
Houthis Enter the War
Yemen's Iran-backed Houthi rebels announced their 'first military operation,' launching ballistic missiles at 'sensitive Israeli military sites' near Beersheba and the Dimona nuclear center. Israel intercepted the projectile. This is the biggest strategic shift since the war began — Houthis had stayed out due to their uneasy Saudi ceasefire. Their entry threatens Bab el-Mandeb Strait and Red Sea (the alternative to Hormuz).
2
Prince Sultan Air Base Attack (Saudi Arabia)
Iran fired 6 ballistic missiles and 29 drones at Prince Sultan Air Base (96km from Riyadh). At least 15 US service members wounded (5 serious). A refueler tanker aircraft was also damaged. Over 24 US troops have been wounded at this base in the past week alone.
3
IDF: 70% of Military Industry Targeted
The IDF announced it has targeted thousands of military industry assets (~70%) and will reach ~90% in coming days. This includes ballistic missiles, air defenses, naval weapons, cyber capabilities, and spy satellites. IAF has deployed ~15,000 munitions; combined US-Israeli total exceeds 25,000.
4
Tel Aviv: 1 Killed, 11 Impact Sites
Iranian missiles struck 11 sites in Tel Aviv including a university. One person killed, two wounded. Six separate ballistic missile attacks detected since midnight.
5
Continued Factory Strikes
Iranian citizens bypassing internet blackouts sent videos showing strikes on steel and cement factories across southern, central Iran, and Isfahan. A steel plant bombed yesterday has halted production entirely.
6
USS Tripoli Arrives with 3,500 Marines
The USS Tripoli carrying 3,500 sailors and Marines arrived in the CENTCOM area. Marine Expeditionary Units are typically used for amphibious operations and large-scale evacuations — signaling preparation for escalatory scenarios.
7
Vance: War Continues 'A Little While Longer'
VP Vance said the goal is to 'neuter' Iran for 'a very, very long time' and claimed 'the vast majority of military objectives' have been accomplished. Rubio: operations will conclude 'in the next couple weeks.'
8
Trump Attacks NATO
Trump called NATO's response 'very disappointing' and asked: 'Why would we be there for them if they're not there for us?' This is his sharpest broadside against the alliance since the war began.
9
Reverse Reading of Regime Propaganda
Iran warned a 'heavy price' will be paid for nuclear strikes, accusing the US and Israel of 'playing with fire.' Soufan Center: Iran-Iraq war-era hardliners replacing killed leaders, insisting on major US concessions. Thailand struck a deal with Iran for oil vessel transit through Hormuz — normalizing maritime extortion.
Cumulative Casualties
Iran: 1,937
Lebanon: 1,189
Israel: 20
US: 13
Gulf+Iraq: 130
Region
Killed
Wounded
Iran
~1,937
+24,800
Lebanon
1,189
~3,400
Israel
20
+5,500
US
13
318
Gulf + Iraq
~130
—
Variable Changes
MCI — Military Erosion
GFI — Governance Fragility
Variable
Old
New
Evidence
missile_production (MCI)
91
93 (+2)
IDF: ~70% military industry targeted, approaching 90% | Overnight strikes continue | Times of Israel
war_economy (GFI)
97
99 (+2)
Bombed steel plant halts production | More cement/steel factories hit | Egypt: business curfew | Ethiopia: overnight fuel queues
Day 29 signals: Houthi entry = activation of last proxy reserve. Iran-Iraq war-era hardliners replacing killed leaders = hardening positions. Thailand deal with Iran for Hormuz transit = normalizing maritime extortion. USS Tripoli with 3,500 Marines arrived = preparing amphibious scenarios.
Time Trend
Day
RDI
Δ
Event
1
~15%
—
Khamenei killed
5
~28%
+6
Hormuz threat | Kharg
12
~36%
+8
Karaj | Parchin destroyed
18
~43%
+4
>92% air defense destroyed
24
53.4%
+7.4
Monte Carlo activated
27
55.1%
+0.8
Tangsiri killed | 2/3 production
28
55.5%
+0.4
Arak + Ardakan + steel plants
29
55.8%
+0.3
Houthis enter | 70% military industry | Sultan base
Methodological Limitations
Approximate correlations: ρ values based on analytical judgment. True CI may differ.
65% threshold is an estimate — collapse may occur at 58% (with shock) or 72% (without).
Partial double-counting: missile production and TEL measure aspects of one phenomenon.
Field data may be incomplete or delayed.
Official casualty figures may undercount actual losses.
Conclusion, Day 29
The Regime Death Index rose from 55.5% (Day 28) to 55.8% (Day 29). The modest change (+0.3) despite major events reflects that Houthi entry doesn't yet directly erode Iranian regime variables — it's a long-term strategic factor.
Three key points: First, Houthi entry creates the risk of closing the Red Sea (the alternative to Hormuz). If Houthis target commercial shipping in Bab el-Mandeb, the global energy crisis intensifies and pressure on Trump to either end or escalate the war increases dramatically. Second, the IDF's announcement of approaching 90% destruction of military industry signals entry into the war's military endgame. Third, the Prince Sultan Air Base attack wounding 15+ US troops increases domestic pressure on Trump.
Watch point: If Houthis expand operations (Red Sea shipping attacks), the proxy_network erosion should decrease (indicating active network) but the global war economy comes under extreme pressure.
Status: Pre-Critical | Threshold: 9.2 | Houthi entry = potential accelerator | Energy deadline: April 6