I agree with the previous posters.
the tattoo is very personal to you, therefore I believe that the Traditional tattoo can mean whatever you want it to mean. The Swallow tattoo in particular is very ambiguous and has many meanings over the past century.
Originally, it was tattooed on sailors for good luck, as seeing a swallow at sea indicated that land was nearby. Eventually, having a swallow tattoo was seen as a career-landmark for the sailor as he got the swallow tattoo after sailing a certain amount of miles I believe.
In WW2, as you already mentioned, many sailors, and soldiers even, in the US military got the traditional swallow tattooed on themselves, sometimes with a sweetheart's name in a banner accompanying it.
In Britain in the 60's, 70's and 80's, however, it was associated with 'hard-men', who would have it tattooed on their necks, or on their hands. Traditionally, a swallow tattoo on each hand indicated that "these fists fly" or that they had done time in prison.
The Swallow tattoo is also a symbol for love and loyalty, as swallows choose one mate for life. Swallows also return home every year, so a swallow tattoo might indicate that the person wearing the tattoo feels a deep emotional connection to their hometown.
I plan to have a swallow tattooed on each shoulder blade soon, as a symbol for loyalty and also because I personally love the tattoo and it's history.