Who were the BlueJackets Guard?
The google will not tell. Someone on 7th Avenue is (was?) proud of being a part of it. We salute you all the same.
(NB: 'Bluejacket' is oldish slang for a UK or US sailor. But still...)
6/13 UPDATE: an answer in the comments from 'brooklynpity':
This was a very nice club or organization such as the boy scouts. If I remember well the activities were held at the old courthouse on 44th street and 4th avenue in Sunset Park in Brooklyn. They participated in parades and community activities. It was like a summer camp but all year round. They met twice a week, played dodgeball and other games and acivities, had drill practice. Held field trips and other weekend activities. I was a Blue Jacket almost 20 years ago.