Officer-in-Charge Budget Section
Officer-in-Charge Accounts Section
Office-in-Charge Security Section
Office-in-Charge Personnel NSmen Section
Office-in-Charge Ops Section
Office-in-Charge Finance Section
Office-in-Charge Admin & Finance Section
OCS in windward section
Obliquity of taper section
Oblique section shear capacity
oblique section bearing capacity
O section oriental lily