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Hey, Bernie.

I don't know anything about these USNO A2 subdirectories, but my usno folder is populated with the following files:

Gaia: ~ trane $ ls -l /usr/local/xephem/catalogs/usno
total 1298216
-rw-r--r--? 1 trane? staff????? 8326 May 12? 2004 readast.v10
-rw-r--r--? 1 trane? staff???? 12727 May 12? 2004 readme.v10
-rw-r--r--? 1 trane? staff???? 19366 May 12? 2004 readme.v20
-rw-r--r--? 1 trane? staff????? 4854 May 12? 2004 readmesa.v10
-rw-r--r--? 1 trane? staff????? 1199 May 12? 2004 readmesa.v20
-rw-r--r--? 1 trane? staff???? 11096 May 12? 2004 readpht.v10
-rw-r--r--? 1 trane? staff???? 29134 May 12? 2004 readpmm.v10
-rw-r--r--? 1 trane? staff????? 6201 May 12? 2004 readuse.v10
-rw-r--r--? 1 trane? staff????? 6381 May 12? 2004 readuse.v20
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0000.acc
-rw-r--r--? 1 trane? staff?? 3052152 May 12? 2004 zone0000.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0075.acc
-rw-r--r--? 1 trane? staff?? 9083196 May 12? 2004 zone0075.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0150.acc
-rw-r--r--? 1 trane? staff? 14968068 May 12? 2004 zone0150.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0225.acc
-rw-r--r--? 1 trane? staff? 20472024 May 12? 2004 zone0225.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0300.acc
-rw-r--r--? 1 trane? staff? 25635408 May 12? 2004 zone0300.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0375.acc
-rw-r--r--? 1 trane? staff? 30337008 May 12? 2004 zone0375.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0450.acc
-rw-r--r--? 1 trane? staff? 34453488 May 12? 2004 zone0450.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0525.acc
-rw-r--r--? 1 trane? staff? 37932072 May 12? 2004 zone0525.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0600.acc
-rw-r--r--? 1 trane? staff? 40948416 May 12? 2004 zone0600.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0675.acc
-rw-r--r--? 1 trane? staff? 41942196 May 12? 2004 zone0675.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0750.acc
-rw-r--r--? 1 trane? staff? 40867848 May 12? 2004 zone0750.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0825.acc
-rw-r--r--? 1 trane? staff? 41095488 May 12? 2004 zone0825.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0900.acc
-rw-r--r--? 1 trane? staff? 40869072 May 12? 2004 zone0900.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone0975.acc
-rw-r--r--? 1 trane? staff? 40153776 May 12? 2004 zone0975.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone1050.acc
-rw-r--r--? 1 trane? staff? 39405480 May 12? 2004 zone1050.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone1125.acc
-rw-r--r--? 1 trane? staff? 37838388 May 12? 2004 zone1125.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone1200.acc
-rw-r--r--? 1 trane? staff? 35579316 May 12? 2004 zone1200.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone1275.acc
-rw-r--r--? 1 trane? staff? 32420964 May 12? 2004 zone1275.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone1350.acc
-rw-r--r--? 1 trane? staff? 28552992 May 12? 2004 zone1350.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone1425.acc
-rw-r--r--? 1 trane? staff? 24210864 May 12? 2004 zone1425.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone1500.acc
-rw-r--r--? 1 trane? staff? 19156344 May 12? 2004 zone1500.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone1575.acc
-rw-r--r--? 1 trane? staff? 13976316 May 12? 2004 zone1575.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone1650.acc
-rw-r--r--? 1 trane? staff?? 8609532 May 12? 2004 zone1650.cat
-rw-r--r--? 1 trane? staff????? 2880 May 12? 2004 zone1725.acc
-rw-r--r--? 1 trane? staff?? 2858460 May 12? 2004 zone1725.cat

It's probably worth noting that way back in ~2005-ish, I purchased the commercial release of XEphem 3.6.3, so I suspect the USNO files were populated through that vector during the install of Disk 2.

I hope that helps at least a little.

trane