Section 1 applies to all militia, both regular and volunteer. For example, this law would not have authorized a volunteer company of composed of women, children or slaves (or free men of color). Distinctions and exceptions specifically applyling to volunteer militia are defined in this section. Otherwise the law applies to all militia in the State of Louisiana.

SECTION 42. Be it further enacted, &c., That Volunteer Companies, Battalions, Regiments and Brigades may be organized in this State under the same rules as Companies, Battalions, Regiments and Brigades of the regular Militia, with the following exceptions and regulations: Each company shall consist of not less than sixty privates for Artillery and Infantry, and thirty-two for Cavalry; provided, that no Company shall have more than one hundred privates; ten companies shall form one regiment; and not less than four nor more than six Regiments shall form a Brigade, and any Company of Artillery or Cavalry may be attached to a Volunteer Brigade with the consent of the Commander-in-Chief. The volunteer companies, Regiments and Brigades may determine the mode of electing or appointing their own officers, which officers shall be the same as are provided by this act for the militia, and be subject of the Commander-in-Chief and the Major-General of the State; Provided, that any Volunteer Company, Regiment or Battalion organized according to this act, which shall not have attached itself to any Brigade within thirty days after the passage of this act may be attached by the Commander-in-Chief to any Brigade, either volunteer or militia.

http://babel.hathitrust.org/cgi/pt?id=dul1.ark%3A%2F13960%2Ft5s76689d;page=root;view=image;size=100;seq=11;num=9

The final section notes that the law takes effect on Feb 15, 1862.