1 February 1918 in which a total of 103 men were killed, an event known as the Battle of May Island. In the subsequent British L-class submarine, the number L13 was not used. Apollo 13 was launched on April 11, 1970, at 13:13:00 CST and suffered an oxygen tank explosion on April 13 at 21:07:53 CST. It returned safely to Earth on April 17. Friday the 13th mini-crash was a stock market crash that occurred on Friday, October 13, 1989. Vehicle registration plates in Ireland are such that the first two digits represent the year of registration of the vehicle (i.e., 11 is a 2011 registered car, 12 is 2012, and so on). In 2012, there were concerns among members of the Society of the Irish Motor Industry (SIMI) that the prospect of having "13" registered vehicles might discourage motorists from buying new cars because of superstition surrounding the number thirteen, and that car sales and the motor industry (which was already doing badly) would suffer as a result. The government, in consultation with SIMI, introduced a system whereby 2013 registered vehicles would have their registration plates' age identifier string modified to read "131" for vehicles registered in the first six months of 2013 and "132" for those registered in the latter six months of the year. Effect on US Shuttle program mission naming The disaster that occurred on Apollo 13 may have been a factor that led to a renaming that prevented a mission called STS-13. STS-41-G was the name of the thirteenth Space Shuttle flight. However, originally STS-41-C was the mission originally numbered STS-13 STS-41-C was the eleventh orbital flight of the space shuttle program. The numbering system of the Space Shuttle was changed to a new one after STS-9. The new naming scheme started with STS-41B, the previous mission was STS-9, and the thirteenth mission (what would have been STS-13) would be STS-41C. The new scheme had first number stand for the U.S. fiscal year, the next number was a launch site (1 or 2), and the next was the number of the mission numbered with a letter for that period. In the case of the actual 13th flight, the crew was apparently not superstitious and made a humorous mission patch that had a black cat on it. Also, that mission re-entered and landed on Friday the 13th which one crew described as being "pretty cool". Because