I believe you are limiting your options with a statement like that.
If I have to acquire a modern truck to pull my old 12 pounder to the front, why can I not procure a modern howitzer and do the same?
Just ask-en mind you. I'm gonna keep the howitzer no mater what.
Yours is a good point.
The cannon used by our Founders to eject their own government's navy from Boston Harbor were taken by force from their own government's Fort Ticonderoga.
The American Revolution was not a war between America and Great Britain. It was a revolution carried out by freedom-loving individuals against THEIR OWN TYRANNICAL GOVERNMENT.
When Paul Revere rode to warn the countryside that an attack was planned on the people, he yelled out, not "The British are coming!", but "The Regulars are coming!"; meaning the regular army of his own government.