Immigration Sign
The immigration sign was a California highway Road traffic safety, safety sign warning motorists to avoid Illegal immigration to the United States, undocumented immigrants darting across the road. It depicted a man, woman, and girl with pigtails running. The California Department of Transportation (Caltrans) erected the signs in 1990 in response to over one hundred immigrant pedestrian deaths due to traffic collisions from 1987 to 1990 in two corridors along Interstate 5 in California, Interstate 5 along the San Ysidro Port of Entry at the Mexico–United States border and approximately north at the San Clemente, California, San Clemente United States Border Patrol United States Border Patrol interior checkpoints, checkpoint in Marine Corps Base Camp Pendleton, Camp Pendleton. Eventually the signs became obsolete after Caltrans erected fences in the freeway's median, and the Border Patrol implemented Operation Gatekeeper in 1995, forcing illegal immigration attempts further east. N ...
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W54 Special (CA-San Ysidro) -vector
The W54 (also known as the Mark 54 or B54) was a Tactical nuclear weapon, tactical nuclear weapon, nuclear warhead developed by the United States in the late 1950s. The weapon is notable for being the smallest nuclear weapon in both weight and yield to have entered US service. It was a compact implosion device containing plutonium-239 as its fissile material, and in its various versions and mods it had a yield of . The weapon had two distinct versions: a warhead used in the AIM-26 Falcon air-to-air missile and in the Davy_Crockett_(nuclear_device), Davy Crockett Recoilless rifle, recoilless gun, and another used in the Special Atomic Demolition Munition (SADM) system, along with several mods (modifications) for each version. The two types are distinct in that much of the design between them was different, to the point that during the development of the SADM it was proposed that it be given its own unique mark designation. A later development was the W72, which was a rebuilt W5 ...
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