well as far as i know yep, mono-intake is the only way. or at
least as far as i've seen. like obersturmfuhrer
says there may not be any specific directive saying so but just the
same i've never heard of it happening.
ORD'd a long time ago; my understanding was built from the days
when they were all under 7 SIB: 1st GDS/SAFGU, 2nd GDS/8 SIR, 1st
CDO, 10th CDO, School of Commando Training, & later 3rd GDS/7
SIR.
wow, when was that? must've been wayyy back when.