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1.
BA1100N or BA1100N with a Sierra Tango ring. an inside joke in the U.S. Military. Said as "Bee Ay eleven hundred November" or "Bee Ay eleven hundred November with a Sierra Tango ring"

when written down, it is a balloon or a balloon with a string.

it is a way to get rid of a new recruit by sending to go do something that makes them look stupid and waste time, ending in some form of extra workload for them. it is sometimes considered very insulting to the person you send them to, because you will not find a balloon- and they can not return without one. it is best used when you know the other person involved.
0311: "hey Boot!"

Boot: "Corporal?"

0311: "Why in all that is green and holy do you not have a BA1100N secured to your gear? Go down to supply and get fit for a BA1100N with a Sierra Tango ring. and for fuck's sake make sure it fits on your A.L.I.C.E. pack before you leave!"

Boot goes to supply to get a balloon on a string to attach to his backpack. Can now be found polishing stones with a single q-tip or guarding a used coffee filter at the position of attention in 120 degree weather for the next day.
by Marines is capitalized January 21, 2011