I have worked primarily for the prime contractor on Department of Navy work. Either at a prime ship repair yard or an AIT. They take time cards very seriously.

I have worked primarily for the prime contractor on Department of Navy work. Either at a prime ship repair yard or an AIT. They take time cards very seriously. I'd suspect you might get some wiggle room in the public realm/software, but as someone mentioned below I'd prefer my time/money trade to be explicitly laid out.