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).
Deductible: All medical expenses that are applicable to the health plan's deductible qualify for reimbursement. This plan design does not include co-pays or co-insurance amounts. Qualified expenses are those incurred by the employee or the employee's family.