Answered anyhow. He slipped card and letter into his sidepocket, reviewing again the soldiers on parade. Where’s old Tweedy’s regiment? Castoff soldier. There: bearskin cap and hackle plume. No, he’s a grenadier. Pointed cuffs. There he is: royal Dublin fusiliers. Redcoats. Too showy. That must be why the women go after them. Uniform. Easier to enlist and drill. Maud Gonne’s letter about taking them off O’Connell street at night: disgrace to our Irish capital. Griffith’s paper is on the same tack now: an army rotten with venereal disease: overseas or halfseasover empire. Half baked they look: hypnotised like. Eyes front. Mark time. Table: able. Bed: ed. The King’s own. Never see him dressed up as a fireman or a bobby. A mason, yes.
He strolled out of the postoffice and turned to the right. Talk: as if that would mend matters. His hand went into his pocket and a forefinger felt its way under the flap of the envelope, ripping it open in jerks. Women will pay a lot of heed, I don’t think. His fingers drew forth the letter the letter and crumpled the envelope in his pocket. Something pinned on: photo perhaps. Hair? No.
annotation:
I looked up Tweedy’s regiment and only found references to Clan Tweedy. Admiral Sir Hugh Tweedie was was aide-de-camp to King George V in 1925 as I found out in the wiki article, but his career was mostly in the navy so that is most likely just a strange coincidence. I remembered he mentioned “Old Tweedy” before when talking about a soldier and as I did a little more digging and found out it’s a reference to Molly’s father. I can see how Bloom is equating his father in law with the anoyance of an English military presence and how he transposes his distaste for Tweedy’s authority onto Maud Gonne and Griffith’s paper. I think the line “Talk: as if that would mend matters.” references both English / Irish relations and the problems he sees in his own family. I also find it entertaining that Bloom considers irony that King George V dresses like a soldier and a mason, 
both things he seems to view with disdain and not more helpful uniformed vocations like a police officer or fireman. I love the line “That must be why the women go after them. Uniform. Easier to enlist and drill.” referring to men in uniform. It should be enjoyable to draw.