Hi Gary,
N.N. means name not known
rt. is the abbreviation for rot meaning red
ws. = weiss = white
ge. = gelb = yellow
sw. = schwarz = black
The numbers are tactical markings and the bar after the balkenkreuz "+" identifies the gruppe
see the following link
http://www.xs4all.nl/~rhorta/jgmark.htm
ws. 9+I would be White 9 of III.Gruppe
PD + EG is what is known as stammkennziechen which are factory codes.
verw. means verwundet = wounded
verl. means verletz = injured
v. means vermissen = missing
(v.) means missing but returned later
KG. means kampfgefangen = captured (POW)
(KG.) probably means captured but escaped later
I appologise for any errors with the translation as my German is very poor.
Best Regards
Andy Fletcher