If you're hoping to seal the deal on some subcontracting work, there are things you can do to improve your chances.
As much as primes are looking for quality products at reasonable prices, they are also looking for subcontractors that can help them hold up their end of the bargain with the government and make the contract go smoothly.
Is there anything that could tip the scales in your favor? You can greatly improve your chances of getting the job if you can show that you are willing and able to learn the prime's protocols, do the required conferencing and follow-ups, and familiarize yourself with any required contract details and forms.
As a sub, timing is crucial and communication is essential. Let the prime know that you are aware of this and are ready to satisfy their needs in these areas as well.
Lastly, all things being equal, most primes will choose the subcontractor that they think they can work with the easiest and the best.