Uniforms
I have gotten this information from my battalion's handbook, and I think most of the information is the same for all battalions.  If your information is different let me know and I will add yours to this
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Hair must be off ears and collar.  No ponytails.
Only black scrunchies can be worn. (My school)
Scrunchies must be color of hair. (Other school)
Only one ring per hand can be worn.
Black socks or nylons (nude, beige, tan, taupe) must be worn. 
Only one set of stud earrings can be worn that coincide to each other.
No flashy or an excessive amount of make-up should be worn.
Only clear, skin tone, or natural color nail polish is acceptable.
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[Links] Class B
Board Rank: On shoulder tabs.
AJROTC Battalion Links
Name Tag: Aligned with the top button and centered on the seam.
JROTC Related Links
JROTC Yahoo Clubs
Ribbons: Aligned with the top button and centered (left-right) on the seam.
E-mail Me
Star: Centered (left-right) and 1/4 inch above the name tag.
Wreath: Centered (left-right) and 1/8 inch above the name tag.  The star is placed inside the wreath.
School Crest: Centered between the third and fourth buttons and placed on the seam.
Pins: Placed between the second and third button and centered (left-right) on the seam.  Each pin is placed 1/4 inch apart from each other.
Cords: A maximum of two cords can be worn.  If one is worn, it goes on the left.  If two are worn, the highest goes on the left.
Class A
Rank: 1/2 inch from the edge of the shoulder seam.  Arrows always point toward the collar.
School Shoulder Patch: Centered on the shoulder sleeve.  1/2 inch down from the shoulder seam.
JROTC Shoulder Patch: Centered on the shoulder sleeve.  1/2 inch down from the shoulder seam.
Star: Centered (left-right) 1/4 inch above the name tag.
Academic Wreath: Centered (left-right) 1/8 inch above the name tag.
Name Tag: The bottom of the name tag is align with the top of the first button; centered on the seam.
School Crest: Centered between the second and third button, placed on the seam.
Ribbons: The bottom of the ribbons are align with the top of the first button; centeres on the seam.
Pins: Place between the second and third button, centered (left-right) on the seam.  Each pin is placed 1/4 inch apart.
JROTC Pin (Officers): Placed diagnolly on the upper lapel.
Cords: A maximum of two cords can be worn.  If one is worn, it goes on the left.  If two are worn, the highest goes on the left.
Male Unifom
Requirements
Clean cut hair cuts, off ears and collar.
A clean shaved face; mustaches should not be any wider than the width of the mouth.
No side burns.
No earrings worn with uniform.
Only black socks should be worn with the uniform.
Allowed only one ring per hand.
Class B
Board Rank: On shoulder tabs.
Name Tags: Centered between the top of the pocket and the pocket button.
Ribbons: Centered on the pocket and stacked up from the top of the pocket.
Star: 1/4 inch above the top of the pocket and centered (left-right) with the pocket.
Wreath: 1/8 inch above the top of the pocket and centered (left-right) with the pocket.  The star is worn inside the wreath.
School Crest: Centered (left-right) with the pocket and centered between the bottom of the pocket flap and the bottom of the pocket.
Pins: Centered between the bottom of the pocket flap and the bottom of the pocket.  Each pin should be 1/4 inch apart from each other.
Cords: A maximum of two cords can be worn.  If one is worn, it goes on the left.  If two are worn, the highest goes on the left.
Class A
Rank: 1/2 inch from the edge of the shoulder seam.  Arrows always point towards collar.
School Shoulder Patch: Centered on shoulder sleeve.  1/2 inch down from the shoulder seam.
JROTC Shoulder Patch: Centered on shoulder sleeve.  1/2 inch down from the shoulder seam.
Star: 1/4 inch above the top of the pocket.  Centered (left-right) with the pocket.
Academic Wreath: 1/8 inch above the top of the pocket.  Centered (left-right) with pocket.  Star is placed inside the wreath.
Name Tag: Centered between the top of the pocket and the pocket button.
School Crest: Centered (left-right) on pocket and centered between the bottom of the pocket flap and the bottom of the pocket.
Ribbons: Center on the pocket.  Stacked from the top of the pocket.
Pins: Centered (top-bottom) between the bottom of the flap and the bottom of the pocket.  Each pin is placed 1/4 inch apart from each other.
Cords: A maximum of two cords can be worn.  If one is worn, it goes on the left.  If two are worn, the highest goes on the left.
BDU
Enlisted
Name Tag: Placed 1/4 inch above the seam of the pocket and centered (left-right).
JROTC Patch: Placed 1/4 inch above the seam of the pocket and centered (left-right).
Officer
Name Tag: Placed 1/4 inch above the seam of the pocket and centered (left-right).
JROTC Patch: Placed 1/4 inch above the seam of the pocket and centered (left-right).
Rank: Placed one inch in from the top edge of the lapel on the jacket.  Rank is placed straight up and down.
JROTC Pin: Placed one inch on from the top edge of the lapel on the jacket.  Rack is placed straight up and down so that the "R" is on the bottom.