Here is the right way to ask Bloomberg:

holidays = blp.bds(
'USD Curncy',
'CALENDAR_NON_SETTLEMENT_DATES',
SETTLEMENT_CALENDAR_CODE='FD',
CALENDAR_START_DATE='20250101',
CALENDAR_END_DATE='20261231'
)

print(holidays)

N.B. 'FD' is the calendar for the US.

You will get a DataFrame, with the column 'holiday_date' and the different dates written in format yyyy-mm-dd