Four schemes are provided.
Photos of the actual aircraft are posted here so one knows which optional parts to use for each scheme as the instructions do not indicate them.
Pilatus PC-6/B2-H4 Turbo Porter, "Armee de Terre"
Koksijde Air Base, France, September 2005
1954-2004 50th Anniversary scheme
Step 13, use parts C6+C5, C4+C7
Step 18, use parts C8+C9, D26, and PE28
Step 22, use part E6
Step 23, use parts P56 & PE57
For this timeline, you can use parts C3 as shown in step 23:
Pilatus PC-6/B2-H4 Turbo Porter
Swiss Air Force
Toronto, Canada, August 1981
Step 13, use Parts C14
Step 18, use parts E10+E14
Step 23 use parts C3
Pilatus PC-6/B2-H2 Turbo Porter
JA2881
Japan Polar Research at Antartica, 1980 (click image for a walk around photo sets):
Complete and use skis from Step 14 & 15
Step 18, use E10+E14
Step 23 use parts C3
Ill Fated Pilatus PC-6/B2-H4 Turbo Porter
UN mission, Western Sahara, August 1991
Crashed June 21st, 1993 in Answard, killing 3:
Step 13, use parts C4+C7, C5+C6
Step 18, use parts C8+C9
Step 23, use parts C3, P56 & PE57
Also, many parts are included for the Fairchild AU-23 one can use for this scheme.
Step 9, use parts E11+E13, unmarked part C19 (next to parts C10 on the sprue tree) and a scratch-built exhaust:
Royal Thai Air Force:
Experimental with minigun instead of 20mm: