On January 17, 2016, USPS made several changes to their services, rates, and package names. The updates are reflected in this release, and include the following changes:
Standard Post renamed “Retail Ground” Flat Rate Box for Priority Mail Express Eliminated Because the USPS changes are not included in the security patch, earlier versions of Magento must be updated by installing the SUPEE-7616 patch. The patch is available for download in the same location as the security patch bundle.
I haven't enabled USPS from my admin. I was wondering if I need to install this patch.
Reason I am asking this is because I haven't installed earlier version of patches of USPS. To install this patch I will have to install them all.