The federal hiring process is particularly focused on experience rather than direct personal connections; there's particular caution about nepotism, etc. Networking is always a great way to learn about new opportunities, but the best thing your friend can do is gain relevant experience to the particular type of job he'd apply for. It sounds like he might be well prepared to apply for a job in some kind of acquisitions role, but he could strengthen his credentials by gaining other types of paid or unpaid experiences.