The Memorandum of Understanding (MOU) on Data contained in the START Treaty establishes a benchmark data base and categories of Treaty Limited Items (TLI) for the Treaty. This facilitates verification of compliance with Treaty obligations. The data contained in the MOU are accurate as of September 1, 1990. An update to the data will be exchanged 30 days after the Treaty enters into force, and baseline inspections will be conducted to help verify the data. The chart below contains those US and Soviet strategic nuclear delivery vehicles (SNDVs) and their warheads, which are subject to the central limits. The second chart illustrates how central limits will affect current forces.
| Weapon Type | US Forces Deployed SNDVs | Accountable Warheads | Weapon Type | Soviet Forces Deployed SNDVs | Accountable Warheads | |
|---|---|---|---|---|---|---|
| ICBMs | MMII | 450 | 450 | SS-11 | 326 | 326 |
| MMIII | 500 | 1500 | SS-13 | 40 | 40 | |
| PK | 50 | 500 | SS-17 | 47 | 188 | |
| --- | --- | --- | --- | SS-18 | 308 | 3080 |
| --- | --- | --- | --- | SS-19 | 300 | 1800 |
| --- | --- | --- | --- | SS-24 (silo) | 56 | 560 |
| --- | --- | --- | --- | SS-24 (mobile) | 33 | 330 |
| --- | --- | --- | --- | SS-25 (mobile) | 288 | 288 |
| SLBMs | Poseidon | 192 | 1920 | SS-N-6 | 192 | 192 |
| Trident I | 384 | 3072 | SS-N-8 | 280 | 280 | |
| Trident II | 96 | 768 | SS-N-17 | 12 | 12 | |
| --- | --- | --- | --- | SS-N-18 | 224 | 672* |
| --- | --- | --- | --- | SS-N-20 | 120 | 1200 |
| --- | --- | --- | --- | SS-N-23 | 112 | 448 |
| Total ICBMs & SLBMs | 1672 | 8210 | --- | 2338 | 9416 | |
| Heavy Bombers | B-52(ALCM) | 189 | 1968 | Bear (ALCM) | 84 | 672 |
| B-52(Non-ALCM) | 290 | 290 | Bear (Non-ALCM) | 63 | 63 | |
| B-1 | 95 | 95 | Blackjack | 15 | 120 | |
| B-2 | 0 | 0 | --- | --- | --- | |
| Total Heavy Bombers | 574 | 2353 | --- | 162 | 855 | |
| *Attribution of 3 warheads in accordance with downloading provisions | ||||||
| Effect of START Reductions on Current Forces | |||
|---|---|---|---|
| START Limits | US Totals (% Reduction Required) | Soviet Totals (% Reduction Required) | |
| SNDVs | 1600 | 2246 (29%) | 2500 (36%) |
| ICBM & SLBM Warheads | 4900 | 8210 (40%) | 9416 (48%) |
| Total Accountable Warheads | 6000 | 10563 (43%) | 10271 (42%) |
| Heavy ICBM Warheads | 1540 | 0** | 3080 (50%) |
| Mobile ICBM Wareheads | 1100 | 0** | 618 (0%) |
| Throw-weight of ICBMs & SLBMs | 3600 MT | 2361.3 MT (0%) | 6626.3 MT (46%) |
| **US has not deployed these systems. | |||