# Operation Guardian

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Operation Guardian was a series of 14 nuclear tests conducted by the United States in 1980–1981 at the Nevada Test Site. These tests followed the Operation Tinderbox series and preceded the Operation Praetorian series.
United States' Guardian series tests and detonations :
| Name | Date time (UT) | Local time zone | Location | Elevation + height | Delivery Purpose | Device | Yield | Fallout | Notes |
| Miners Iron | October 31, 1980 18:00:00.09 | PST (–8 hrs) | NTS Area U12n.11 37°12′40″N 116°12′23″W﻿ / ﻿37.21121°N 116.20626°W﻿ / 37.21121; -116.20626﻿ (Miners Iron) | 2,212 m (7,257 ft) – 389.5 m (1,278 ft) | tunnel, weapon effect | | 10 kt | Venting detected, 0.3 Ci (11 GBq) | |
| Dauphin | November 14, 1980 16:50:00.084 | PST (–8 hrs) | NTS Area U9cq 37°06′41″N 116°01′10″W﻿ / ﻿37.11144°N 116.01952°W﻿ / 37.11144; -116.01952﻿ (Dauphin) | 1,306 m (4,285 ft) – 320 m (1,050 ft) | underground shaft, weapons development | Experimental test for nuclear pumped x-ray laser | 2 kt | | |
| Baseball | January 15, 1981 20:25:00.09 | PST (–8 hrs) | NTS Area U7ba 37°05′12″N 116°02′45″W﻿ / ﻿37.08675°N 116.04585°W﻿ / 37.08675; -116.04585﻿ (Baseball) | 1,232 m (4,042 ft) – 563.88 m (1,850.0 ft) | underground shaft, weapons development | W76 | 99 kt | | Stockpile confidence test |
| Clairette | February 5, 1981 18:00:00.117 | PST (–8 hrs) | NTS Area U3kr 37°00′39″N 116°01′58″W﻿ / ﻿37.01088°N 116.03291°W﻿ / 37.01088; -116.03291﻿ (Clairette) | 1,182 m (3,878 ft) – 353.6 m (1,160 ft) | underground shaft, weapons development | W80 | less than 20 kt | | W80 low temperature test. Fizzled |
| Seco | February 25, 1981 15:00:00.082 | PST (–8 hrs) | NTS Area U8l 37°10′55″N 116°05′06″W﻿ / ﻿37.18185°N 116.08512°W﻿ / 37.18185; -116.08512﻿ (Seco) | 1,356 m (4,449 ft) – 200 m (660 ft) | underground shaft, weapons development | | less than 20 kt | | |
| Vide | April 30, 1981 14:35:00.084 | PST (–8 hrs) | NTS Area U8k 37°10′38″N 116°05′08″W﻿ / ﻿37.17731°N 116.08567°W﻿ / 37.17731; -116.08567﻿ (Vide) | 1,346 m (4,416 ft) – 323 m (1,060 ft) | underground shaft, weapons development | | less than 20 kt | Venting detected, 3 Ci (110 GBq) | |
| Aligote | May 29, 1981 16:00:00.094 | PST (–8 hrs) | NTS Area U7bg 37°06′06″N 116°00′18″W﻿ / ﻿37.1018°N 116.00493°W﻿ / 37.1018; -116.00493﻿ (Aligote) | 1,311 m (4,301 ft) – 320 m (1,050 ft) | underground shaft, weapons development | | 2.5 kt | | |
| Harzer | June 6, 1981 18:00:00.084 | PST (–8 hrs) | NTS Area U19aj 37°18′12″N 116°19′35″W﻿ / ﻿37.30334°N 116.32648°W﻿ / 37.30334; -116.32648﻿ (Harzer) | 2,073 m (6,801 ft) – 637 m (2,090 ft) | underground shaft, weapons development | | 140 kt | | |
| Niza | July 10, 1981 14:00:00.096 | PST (–8 hrs) | NTS Area U9cr 37°07′43″N 116°02′05″W﻿ / ﻿37.12856°N 116.03464°W﻿ / 37.12856; -116.03464﻿ (Niza) | 1,266 m (4,154 ft) – 341 m (1,119 ft) | underground shaft, weapons development | | 4 kt | I-131 venting detected, 0 | |
| Pineau | July 16, 1981 15:00:00.096 | PST (–8 hrs) | NTS Area U7ao 37°05′19″N 116°01′13″W﻿ / ﻿37.08865°N 116.02024°W﻿ / 37.08865; -116.02024﻿ (Pineau) | 1,259 m (4,131 ft) – 207.26 m (680.0 ft) | underground shaft, weapons development | | less than 20 kt | | |
| Havarti | August 5, 1981 13:41:00.086 | PST (–8 hrs) | NTS Area U10bg 37°09′13″N 116°02′09″W﻿ / ﻿37.15369°N 116.03594°W﻿ / 37.15369; -116.03594﻿ (Havarti) | 1,283 m (4,209 ft) – 200 m (660 ft) | underground shaft, weapons development | | less than 20 kt | I-131 venting detected, 0 | |
| Islay | August 27, 1981 14:31:00.088 | PST (–8 hrs) | NTS Area U2er 37°09′37″N 116°04′03″W﻿ / ﻿37.16038°N 116.06743°W﻿ / 37.16038; -116.06743﻿ (Islay) | 1,297 m (4,255 ft) – 294 m (965 ft) | underground shaft, weapons development | | 4 kt | Venting detected, 700 Ci (26,000 GBq) | |
| Trebbiano | September 4, 1981 15:00:00.103 | PST (–8 hrs) | NTS Area U3lj 37°03′29″N 116°02′56″W﻿ / ﻿37.05806°N 116.04894°W﻿ / 37.05806; -116.04894﻿ (Trebbiano) | 1,211 m (3,973 ft) – 305.4 m (1,002 ft) | underground shaft, weapons development | | 1 kt | Venting detected, 200 Ci (7,400 GBq) | |
| Cernada | September 24, 1981 15:00:00.089 | PST (–8 hrs) | NTS Area U3kk 37°00′31″N 116°01′28″W﻿ / ﻿37.00851°N 116.02453°W﻿ / 37.00851; -116.02453﻿ (Cernada) | 1,181 m (3,875 ft) – 213.2 m (699 ft) | underground shaft, weapons development | | less than 20 kt | | |
* ↑ The US, France and Great Britain have code-named their test events, while the USSR and China did not, and therefore have only test numbers (with some exceptions – Soviet peaceful explosions were named). Word translations into English in parentheses unless the name is a proper noun. A dash followed by a number indicates a member of a salvo event. The US also sometimes named the individual explosions in such a salvo test, which results in "name1 – 1(with name2)". If test is canceled or aborted, then the row data like date and location discloses the intended plans, where known.
* ↑ To convert the UT time into standard local, add the number of hours in parentheses to the UT time; for local daylight saving time, add one additional hour. If the result is earlier than 00:00, add 24 hours and subtract 1 from the day; if it is 24:00 or later, subtract 24 hours and add 1 to the day. Historical time zone data obtained from the IANA time zone database.
* ↑ Rough place name and a latitude/longitude reference; for rocket-carried tests, the launch location is specified before the detonation location, if known. Some locations are extremely accurate; others (like airdrops and space blasts) may be quite inaccurate. "~" indicates a likely pro-forma rough location, shared with other tests in that same area.
* ↑ Elevation is the ground level at the point directly below the explosion relative to sea level; height is the additional distance added or subtracted by tower, balloon, shaft, tunnel, air drop or other contrivance. For rocket bursts the ground level is "N/A". In some cases it is not clear if the height is absolute or relative to ground, for example, Plumbbob/John. No number or units indicates the value is unknown, while "0" means zero. Sorting on this column is by elevation and height added together.
* ↑ Atmospheric, airdrop, balloon, gun, cruise missile, rocket, surface, tower, and barge are all disallowed by the Partial Nuclear Test Ban Treaty. Sealed shaft and tunnel are underground, and remained useful under the PTBT. Intentional cratering tests are borderline; they occurred under the treaty, were sometimes protested, and generally overlooked if the test was declared to be a peaceful use.
* ↑ Include weapons development, weapon effects, safety test, transport safety test, war, science, joint verification and industrial/peaceful, which may be further broken down.
* ↑ Designations for test items where known, "?" indicates some uncertainty about the preceding value, nicknames for particular devices in quotes. This category of information is often not officially disclosed.
* ↑ Estimated energy yield in tons, kilotons, and megatons. A ton of TNT equivalent is defined as 4.184 gigajoules (1 gigacalorie).
* ↑ Radioactive emission to the atmosphere aside from prompt neutrons, where known. The measured species is only iodine-131 if mentioned, otherwise it is all species. No entry means unknown, probably none if underground and "all" if not; otherwise notation for whether measured on the site only or off the site, where known, and the measured amount of radioactivity released.