Technically, you have your own discretion to wear whichever one you choose. However, if you've been awarded a CIB, and choose instead to wear an EIB you've earned, you can expect your chain of command to not be particularly thrilled about it.
Wear it with any Class A or Dress Blue uniform. It is to be adorned around the neck underneath the collar of the white shirt, either below the bowtie or atop the necktie.
Yes. If you have earned the Combat Action Badge (CAB) you can wear it on your Class A uniform.
no
Yes.
No the CIB is a an Army award and not transferrable to the Marine Core dress uniform.
When attending an official function of the Ordnance Branch or during times of personally authorized wear of the uniform, at the wearers discretion, but not at official functions. Examples; I am attending a reception for the incoming Chief of Ordnance - I would wear my award. I am attending an officers call with the organization I am assigned to (not an ordnance function) I do not wear my award unless the invite specifically allows "regimental awards permitted". I am attending a local civic function and choose to wear the award for personal reasons, I can wear the award. I have been asked to attend a friends wedding in military uniform - I can wear the award as a choice at my discretion.
Yes you do wear them. It is the same as your Class A Uniform
On social occasions when the prescribed uniform is the Army Blue Uniform, personnel who don't have one are authorized to wear the Army Green Uniform with white shirt and bow tie.
No. The Stanford students don't wear uniforms. The sports teams, as usual, do.
yes
The combat action badge are worn with "Class A" Army green, blue or white uniform coats. You must wear that uniform when wearing the badge.
Yes. It is an Army uniform. Active, Reserve and Guard comform to uniform policy.