Aoa.
Armed forces officers (Permanent commission) have two options.
1. Open merit like all other aspirants but NOC required from GHQ/NHQ/AHQ.
2. 10 percent fixed quota for armed forces
In this quota
First of all interview at base/ brigade level ( generally no interview) just forward names to Command level GOC/AOC.
At command level only interview then AHQ or GHQ
At GHQ or AHQ, series of tests
a) Psychological assessment like in css
b) Career management team interview and scrutiny
c) Essay writing, group discussions and extempore speeches
d) Final interview with Lt General or Air marshal level
After all this only 2 or 3 officers from PAF, 8 to 10 officers from army and 2 or 3 officers Navy are forwarded to FPSC.
At FPSC first of all psychological assessment same as open merit and then final interview.
Three groups are offered to armed forces FSP, PAS and PSP.
Every year 1 officer from PAF, one from navy and 3 to 4 from army are allocated.
Hope it will help to all.