No. The CFC regulations state that the CFC is the only authorized solicitation of employees in the Federal workplace on behalf of charitable organizations. No other solicitation on behalf of charitable organizations may be conducted in the Federal workplace.
These regulations do not apply to the collection of gifts-in-kind, such as food, clothing and toys, or to the solicitation of Federal employees outside of the Federal workplace. Heads of departments or agencies may establish policies and procedures applicable to solicitations conducted by organizations composed of civilian employees or members of the uniformed services among their own members for organizational support or for the benefit of welfare funds for their members.
Please see OPM's FAQs on Special Solicitations During Emergencies and Disasters for information on fundraising in response to emergencies and natural disasters.