Answer:
have a duty to
Explanation:
Different government organizations have different working laws enacted for such institutions or organisations.
For examples Military hospitals are established mainly to offer service to the Military personnel and their family members. General public are not eligible to get admission or treatment in such Military hospitals.
Similarly, many government guest houses are meant for that particular government organisation employees only. General public cannot get admission into such establishment.
There are separate statute for such establishment or organisations.
But these organisation cannot deny admission even to the general person who present themselves to such institutions for emergency cares. Such organisations are liable to offer service to persons for emergency care.
Thus the answer is "have a duty to".