The fastest and most direct way to help soldiers is to talk to a soldier! Or talk to a grassroots organization that is talking to soldiers. Giving money to a large organization with heavy bureaucratic interference will never be the “fastest and most direct way” to help people in need.
Thank G-d, as of April 11th 2024, most of the soldiers’ needs can be answered within Israel itself. Not all, but most. Therefore, reach out to a soldier, figure out what they actually need and make sure the items are picked up from a supplier within 24 hours.
It’s not difficult.