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).
If you are self-employed, you deduct your expenses for qualifying work-related education directly from your self-employment income. This reduces the amount of your income subject to both income tax and self-employment tax.