If you think Britain relies or has relied on your military, your ignorance is off the chart. I am sure 99% of your fellow Americans will think you are talking rot.
You left off the </sarc> tag.
The EU, and GB military has been a paper tiger for years. You implicitly but completely rely on U.S. Military might to keep you from being overrun (by whom is a different thread).
The plain text of the article speaks to the issue.
OR, you can start spending the % of GDP on the military the US does. Or even a teeny tiny fraction thereof.