According to the Commonwealth War Graves Commission, there were eight soldiers named William McBride, and a further six listed as W. McBride, who died in France or Belgium during the First World War but none matches the soldier in the song.
If you do not claim 100% of your self-employed health insurance deduction, you can include the remaining premiums with your other medical expenses as an itemized deduction on Form 1040, Schedule A (PDF).
Self-employment expenses. When you are self-employed, many of the expenses you pay for materials, supplies, marketing, office expenses, insurance, and travel can be deducted when you file your income taxes. Certain utilities, vehicle expenses, and expenses for operating a business from your home may also qualify.