The #111 AT-3A is missing several loadouts and weapon platforms. It has two wingtip pylons that allow for two SRAAMs to be carried, in addition to a built in 20mm. Additionally, its inner pylons allow it to carry #1934 Hsiung Feng II's, #1839 Mk84's, or #1498 Mk.20's.
The specific missing loadouts are:
2x #182 AIM-9P4 or #1767 Sky Sword I + any of the following loadouts
1x #1839 Mk84's + 2x #318 150 USG Drop Tank
1x #1839 Mk84's + 2x Mk82s
1x #1839 Mk84's + 2x #1498 Mk.20's
2x #1498 Mk.20's + 38x #1927 Hydra rockets
2x #1498 Mk.20's + 2x #318 150 USG Drop Tank
4x #1498 Mk.20's
2x Hsiung Feng II's
2x #318 150 USG Drop Tank (both for ferrying and extending the combat radius for CAP)
AT-3A with Hsiung Feng II's and AIM-9Ps
AT-3A with more modern Hsiung Feng II's
AT-3A with droptanks
Sources:
https://www.airforce-technology.com/pro ... -aircraft/ and
https://www.globalsecurity.org/military ... an/ajt.htm
Updated to reflect findings in the comment below.