Do you have to sign when being served court papers in Arizona?

No.

"Service of Summons Upon Individuals. Service upon an individual from whom a waiver has not been obtained and filed, other than those specified in paragraphs (e), (f) and (g) of this Rule 4.1, shall be effected by delivering a copy of the summons and of the pleading to that individual personally or by leaving copies thereof at that individual's dwelling house or usual place of abode with some person of suitable age and discretion then residing therein or by delivering a copy of the summons and of the pleading to an agent authorized by appointment or by law to receive service of process."

ARIZONA RULES OF CIVIL PROCEDURE (http://www.served.com/az.asp)

Do you have to sign anything or do they just drop it there when they see you?