I signed a written contract with a company Tech USA to work for three months at Macdill airforce base.I was told after 3 days that there is no work

It depends on the language in the contract.  Some contracts may have an out for impossibility or similar language.  You should contact a local attorney to determine what options you currently have to receive compensation. This is not intended to be legal advice, and is general in its nature. No attorney-client relationship exists or is formed by this information. Furthermore, this does not represent the views or opinions of LexisNexis or its affiliated companies.