Re: WWII - New Guineau - HO Co 411 Eng Bn
Liana, I am not an expert, but I have a little knowledge (often a dangerous thing) as a hobbyist, and I have also been able to piece together a little info, found primarily online.
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I believe that "HO" is probably "HQ", or headquarters, as in Headquarters Company, 411th Engineer Battalion.
APO 704%PM, San Francisco, Calif would have designated Army Post Office 704 care of Postmaster, San Francisco. APO 704 was Cairns, Queensland, Austrailia.
Click this link for more info regarding the 411th: