Seeking help on dating LTC pins

[ShibaLegend]

I've had these for a while, never really looked into them until recently.

 

When would these have been made?

 

 

 

Thanks in advance.

[ShibaLegend]

Back of top pin.

[ShibaLegend]

Back of bottom pin.

[patches]

They appear to be either Navy/Marine Corps or Air Force small size type, a Missed Matched Pair? the one looks to have a Double Meyer Shields with one being a 9M Shield, the other just a Meyer Shield by itself it looks, so the one with the 9M Shield dates from 1953 till 1965, them Meyer switches to a 22M Shield, the other late 40s early 50s.

[cavcon]

Maybe Air Force.   Navy and marine corps wore/wear smooth finish 

[KurtA]

1950’s USAF collar insignia. 

[ShibaLegend]

Thanks for the replies!